Luminaries including Jeremy Paxman, Twiggy and David Gandy are joining the campaign to turn the lights out across Britain tonight, to mark the 100th anniversary of the country entering the First World War.
The lights of Major landmarks and people's homes will all be switched off and candles lit at 10pm in memory of the devastation and carnage the war wrought.
Millions of people are expected to participate in the Lights Out campaign - where people will switch off all electric light and light a single candle to mark today's centenary - between 10pm and 11pm tonight.
Jeremy Paxman has joined the campaign for #LightsOut
Hundreds of councils, iconic buildings, national organisations, including the BBC and Royal British Legion and places of worship are also expected to take part.
National landmarks buildings including Blackpool illuminations, the Houses of Parliament, Eden Project, the Imperial War Museums and Tower Bridge will also turn off their lights.
London's Piccadilly Circus and the Royal Chelsea Hospital are among the venues that will go dark.
...and model David Gandy
Twitter is awash with people pledging to switch off their lights under the hashtag #lightsout, as well #lestweforget to mark the range of services taking place today, the centenary of Britain entering the war.
Lights Out, organised by veterans' charity The Royal British Legion, is a tribute to the remarks made by Sir Edward Grey, the foreign secretary in 1914, who said on the eve of the war: "The lamps are going out all over Europe and we will not see them lit again in our lifetime."
The charity called it "a symbolic act of reflection and hope".
Kate Middleton is expected to attend a candle-lit service at Westminster Abbey from 10pm, which will extinguish the last candle at 11pm, the moment Britain declared war.
The Royal Chelsea Hospital, whose famous red-coat wearing pensioners are all veterans, will switch off all electric light and have a single candle burning for the hour.
The Legion has produced a video promoting the campaign, which includes figures such as Jeremy Paxman, serving military personnel and Chelsea Pensioners lighting candles.
The Royal British Legion is calling on people to switch off artificial lights to mark the war's centenary
The Legion says it hopes 1 million candles will be lit to "remember each and every one of those Service men and women who gave their lives in the war to end all wars".
But not everyone is thrilled that people are getting in on the act.
In Sussex, firefighters warned those planning to use candles to be careful not to put them next to their curtains or place them in reach of their pets or children.
“We certainly don’t want to discourage anyone from taking part in this national moment of reflection. We just want to remind people to take some simple precautions if they are planning to light a candle," a spokeswoman said.
World War I Remembrance
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Prince Harry taking the salute during the Step Short commemorative event in Folkestone, Kent to commemorate the 100th anniversary of the outbreak of World War One. (credit:PA)
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Prince Harry taking the salute during the Step Short commemorative event in Folkestone, Kent to commemorate the 100th anniversary of the outbreak of World War One. (credit:PA)
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The Road of Remembrance street sign during the Step Short commemorative event in Folkestone, Kent to commemorate the 100th anniversary of the outbreak of World War One. (credit:PA)
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A car of World War 1 vintage carries Chelsea Pensioners, British war veterens from the Chelsea Royal Hospital, and friends through central London on August 4, 2014 as part of a Great War Centenary Parade: a procession of more than 40 Edwardian cars to commemorate Britain's entry into World War 1. Britain ran a series of events as part of the commemoration of the 100th anniversary of the outbreak of World War I, a small Balkans conflict that went global with the German invasion of neutral Belgium in August 1914 which Britain entered on August 4, 2014. .AFP PHOTO / CARL COURT (Photo credit should read CARL COURT/AFP/Getty Images) (credit:CARL COURT via Getty Images)
BRITAIN-WWI-CENTENARY(05 of67)
A car of World War 1 vintage carries Chelsea Pensioners, British war veterens from the Chelsea Royal Hospital, and friends past the Houses of Parliament through central London on August 4, 2014 as part of a Great War Centenary Parade: a procession of more than 40 Edwardian cars to commemorate Britain's entry into World War 1. Britain ran a series of events as part of the commemoration of the 100th anniversary of the outbreak of World War I, a small Balkans conflict that went global with the German invasion of neutral Belgium in August 1914 which Britain entered on August 4, 2014. .AFP PHOTO / CARL COURT (Photo credit should read CARL COURT/AFP/Getty Images) (credit:CARL COURT via Getty Images)
France World War I Ceremony(06 of67)
France's President Francois Hollande and German President Joachim Gauck arrive to attend a ceremony to mark the 100th anniversary of the outbreak of World War I, at the National Monument of Hartmannswillerkop, in Wattwiller, eastern France, Sunday, Aug. 3, 2014. On this day 100-years ago, in 1914, Germany declared war on France, at the beginning of the first global war, which centered on Europe and resulted in over nine million combatants being killed. (AP Photo/Thibault Camus, Pool) (credit:ASSOCIATED PRESS)
France World War I Ceremony(07 of67)
France's President Francois Hollande, left, and German President Joachim Gauck pay respect during a ceremony to mark the 100th anniversary of the outbreak of World War I, at the National Monument of Hartmannswillerkop, in Wattwiller, eastern France, Sunday, Aug. 3, 2014. On this day 100-years ago, in 1914, Germany declared war on France, at the beginning of the first global war, which centered on Europe and resulted in over nine million combatants being killed. (AP Photo/Thibault Camus) (credit:ASSOCIATED PRESS)
France World War I Ceremony(08 of67)
The hands of French President Francois Hollande, right, and German President Joachim Gauck are clasped together, as they symbolically lay the first stone of a building dedicated to the first world war, during the first stone ceremony to mark the 100th anniversary of the outbreak of World War I, at the National Monument of Hartmannswillerkop, in Wattwiller, eastern France, Sunday, Aug. 3, 2014. On this day 100-years ago, in 1914, Germany declared war on France, at the beginning of the first global war, which centred on Europe and resulted in over nine million combatants being killed. (AP Photo/Christophe Karaba, Pool) (credit:ASSOCIATED PRESS)
Britain World War I Commemoration(09 of67)
A sea of red ceramic poppies which form part of an art installation to commemorate World War I is seen in the dry moat of the Tower of London in London, Monday, Aug. 4, 2014. The installation of 888,246 ceramic poppies by ceramic artist Paul Cummins and entitled "Blood Swept Lands and Seas of Red" will be unveiled on August 5 to mark the centenary of World War I, with the final one being planted on Armistice Day on November 11. Each poppy represents a British military fatality from World War I. (AP Photo/Rob Taggart) (credit:ASSOCIATED PRESS)
Belgium World War I Commemoration(10 of67)
Heads of State and other guests participate in a commemoration ceremony to mark the 100th anniversary of the outbreak of World War I at the Cointe Allies' Memorial in Liege, Belgium, Monday, Aug. 4, 2014. The ceremony pays homage to the victims of the war, both soldiers and civilians, from Belgium and abroad, who lost their lives on Belgian soil. (AP Photo/Virginia Mayo) (credit:ASSOCIATED PRESS)
Belgium WWI Commemoration Ceremony(11 of67)
The Duchess of Cambridge is joined by French President Francois Hollande ahead of a ceremony at the Cointe Inter-allied Memorial, Liege, Belgium, commemorating the 100th anniversary of the start of the First World War, Monday Aug. 4, 2014. The ceremony pays homage to the victims of the First World War, both soldiers and civilians, from Belgium and abroad, who lost their lives on Belgian soil.(AP Photo / Francois Lenoir, Pool) (credit:ASSOCIATED PRESS)
Belgium WWI Commemoration Ceremony(12 of67)
Attending a ceremony to commemorate the centenary of the start of the First World War, with left to right, Britain's Prince Duke and Duchess of Cambridge, French President Francois Hollande, Queen Mathilde of Belgium, King Philippe of Belgium and German President Joachim Gauck, as they attend a ceremony at the Cointe Inter-allied Memorial, Liege, Belgium, commemorating the 100th anniversary of the start of the First World War, Monday Aug. 4, 2014. The ceremony pays homage to the victims of the First World War, both soldiers and civilians, from Belgium and abroad, who lost their lives on Belgian soil.(AP Photo / Francois Lenoir, Pool) (credit:ASSOCIATED PRESS)
Belgium World War I Commemoration(13 of67)
Belgium's King Philippe, left, and an unidentified girl attend a commemoration ceremony to mark the 100th anniversary of the outbreak of World War I at the Cointe Allies' Memorial in Liege, Belgium on Monday, Aug. 4, 2014. The ceremony pays homage to the victims of the war, both soldiers and civilians, from Belgium and abroad, who lost their lives on Belgian soil. (AP Photo/Chris Jackson, Pool) (credit:ASSOCIATED PRESS)
Belgium World War I Commemoration(14 of67)
In this Belgium Government image Britain's Prince William and King Felipe VI of Spain have a conversation at the Saint-Laurent Military Quarters in Leige Belgium before ceremonies to mark the 100th anniversary of the start of the First World War Monday Aug. 4, 2014. (AP Photo/Dirk Waem/ Chancellerie du Premier Ministre) (credit:ASSOCIATED PRESS)
Belgium WWI Commemoration Ceremony(15 of67)
Attending a ceremony to commemorate the centenary of the start of the First World War, with left-right, Britain's Duchess of Cambridge, French President Francois Hollande and Queen Mathilde of Belgium, at the Cointe Inter-allied Memorial, Liege, Belgium, commemorating the 100th anniversary of the start of the First World War, Monday Aug. 4, 2014. The ceremony pays homage to the victims of the First World War, both soldiers and civilians, from Belgium and abroad, who lost their lives on Belgian soil .(AP Photo / Chris Jackson, Pool) (credit:ASSOCIATED PRESS)
Belgium World War I Commemoration(16 of67)
Britain's Prince William, foreground, prepares to make a speech during a commemoration ceremony to mark the 100th anniversary of the outbreak of World War I at the Cointe Allies' Memorial in Liege, Belgium on Monday, Aug. 4, 2014. The ceremony pays homage to the victims of the war, both soldiers and civilians, from Belgium and abroad, who lost their lives on Belgian soil. (AP Photo/Virginia Mayo) (credit:ASSOCIATED PRESS)
Belgium World War I Commemoration(17 of67)
Belgium's King Philippe, right, walks with a small girl during a commemoration ceremony to mark the 100th anniversary of the outbreak of World War I at the Cointe Allies' Memorial in Liege, Belgium on Monday, Aug. 4, 2014. The ceremony pays homage to the victims of the war, both soldiers and civilians, from Belgium and abroad, who lost their lives on Belgian soil. (AP Photo/Virginia Mayo) (credit:ASSOCIATED PRESS)
Belgium World War I Commemoration(18 of67)
Belgium's King Philippe, left, prepares to lay a wreath during a commemoration ceremony to mark the 100th anniversary of the outbreak of World War I at the Cointe Allies' Memorial in Liege, Belgium on Monday, Aug. 4, 2014. The ceremony pays homage to the victims of the war, both soldiers and civilians, from Belgium and abroad, who lost their lives on Belgian soil. (AP Photo/Virginia Mayo) (credit:ASSOCIATED PRESS)
Belgium World War I Commemoration(19 of67)
From left, Britain's Prince William, his wife Kate, Duchess of Cambridge, French President Francois Hollande, Belgium's Queen Mathilde, Belgium's King Philippe, German President Joachim Gauck and Spain's King Felipe stand on the podium during a commemoration ceremony to mark the 100th anniversary of the outbreak of World War I at the Cointe Allies' Memorial in Liege, Belgium on Monday, Aug. 4, 2014. The ceremony pays homage to the victims of the war, both soldiers and civilians, from Belgium and abroad, who lost their lives on Belgian soil. (AP Photo/Virginia Mayo) (credit:ASSOCIATED PRESS)
Belgium World War I Commemoration(20 of67)
French President Francois Hollande, center left, embraces German President Joachim Gauck, center right, as they participate in a commemoration ceremony to mark the 100th anniversary of the outbreak of World War I at the Cointe Allies' Memorial in Liege, Belgium on Monday, Aug. 4, 2014. The ceremony pays homage to the victims of the war, both soldiers and civilians, from Belgium and abroad, who lost their lives on Belgian soil. (AP Photo/Virginia Mayo) (credit:ASSOCIATED PRESS)
Belgium WWI Commemoration Ceremony(21 of67)
Attending a ceremony to commemorate the centenary of the start of the First World War, Britain's Duchess of Cambridge, at the Cointe Inter-allied Memorial, Liege, Belgium, commemorating the 100th anniversary of the start of the First World War, Monday Aug. 4, 2014. The ceremony pays homage to the victims of the First World War, both soldiers and civilians, from Belgium and abroad, who lost their lives on Belgian soil. (AP Photo / Chris Jackson, Pool) (credit:ASSOCIATED PRESS)
APTOPIX Belgium WWI Commemoration Ceremony(22 of67)
Attending a ceremony to commemorate the centenary of the start of the First World War, Britain's Duke and Duchess of Cambridge, at the Cointe Inter-allied Memorial, Liege, Belgium, commemorating the 100th anniversary of the start of the First World War, Monday Aug. 4, 2014. The ceremony pays homage to the victims of the First World War, both soldiers and civilians, from Belgium and abroad, who lost their lives on Belgian soil. (AP Photo / Chris Jackson, Pool) (credit:ASSOCIATED PRESS)
APTOPIX Belgium World War I Commemoration(23 of67)
French President Francois Hollande, center left, embraces German President Joachim Gauck, center right, as they participate in a commemoration ceremony to mark the 100th anniversary of the outbreak of World War I at the Cointe Allies' Memorial in Liege, Belgium on Monday, Aug. 4, 2014. The ceremony pays homage to the victims of the war, both soldiers and civilians, from Belgium and abroad, who lost their lives on Belgian soil. (AP Photo/Virginia Mayo) (credit:ASSOCIATED PRESS)
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The Duke and Duchess of Cambridge speak with French President Francois Hollande ahead of a ceremony at the Cointe Inter-allied Memorial, Lige, Belgium, commemorating the 100th anniversary of the start of the First World War. (credit:Jonathan Brady/PA Wire)
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Britain's Prince William and wife Catherine attend on August 4, 2014 in Liège, Belgium, commemorations marking 100 years since the invasion of Belgium by Germany at the start of World War I. World leaders leaders on Monday commemorated the 100th anniversary of the outbreak of World War I, a small Balkans conflict that went global with the German invasion of neutral Belgium in August 1914. AFP PHOTO / FRED DUFOUR (Photo credit should read FRED DUFOUR/AFP/Getty Images) (credit:FRED DUFOUR via Getty Images)
FRANCE-BELGIUM-HISTORY-WAR-WWI-CENTENARY(26 of67)
Britain's Prince William and wife Catherine shake hands with French President Francois Hollande (R) as they arrive on August 4, 2014 in Liege, Belgium, for commemorations marking 100 years since the invasion of Belgium by Germany at the start of World War I. World leaders leaders on Monday commemorated the 100th anniversary of the outbreak of World War I, a small Balkans conflict that went global with the German invasion of neutral Belgium in August 1914. AFP PHOTO / FRED DUFOUR (Photo credit should read FRED DUFOUR/AFP/Getty Images) (credit:FRED DUFOUR via Getty Images)
FRANCE-BELGIUM-HISTORY-WAR-WWI-CENTENARY(27 of67)
Britain's Prince William and wife Catherine arrive on August 4, 2014 in Liege, Belgium, for commemorations marking 100 years since the invasion of Belgium by Germany at the start of World War I. World leaders leaders on Monday commemorated the 100th anniversary of the outbreak of World War I, a small Balkans conflict that went global with the German invasion of neutral Belgium in August 1914. AFP PHOTO / FRED DUFOUR (Photo credit should read FRED DUFOUR/AFP/Getty Images) (credit:FRED DUFOUR via Getty Images)
FRANCE-BELGIUM-HISTORY-WAR-WWI-CENTENARY(28 of67)
Britain's Prince William and wife Catherine sit next to French President Francois Hollande (R) as they arrive on August 4, 2014 in Liege, Belgium, for commemorations marking 100 years since the invasion of Belgium by Germany at the start of World War I. World leaders leaders on Monday commemorated the 100th anniversary of the outbreak of World War I, a small Balkans conflict that went global with the German invasion of neutral Belgium in August 1914. AFP PHOTO / FRED DUFOUR (Photo credit should read FRED DUFOUR/AFP/Getty Images) (credit:FRED DUFOUR via Getty Images)
Britain World War I Ceremony(29 of67)
Ceramic poppies forming part of an art installation stand laid out in the dry moat of the Tower of London in London, Sunday, Aug. 3, 2014. The installation of 888,246 ceramic poppies by ceramic artist Paul Cummins entitled "Blood Swept Lands and Seas of Read" will be unveiled on August 5 to mark the centenary of World War I, with the final one being planted on Armistice Day on November 11. Each poppy represents a British military fatality from World War I. (AP Photo/Matt Dunham) (credit:ASSOCIATED PRESS)
FRANCE-BELGIUM-HISTORY-WAR-WWI-CENTENARY(30 of67)
Britain's Prince William and wife Catherine attend on August 4, 2014 in Liège, Belgium, commemorations marking 100 years since the invasion of Belgium by Germany at the start of World War I. World leaders leaders on Monday commemorated the 100th anniversary of the outbreak of World War I, a small Balkans conflict that went global with the German invasion of neutral Belgium in August 1914. AFP PHOTO / FRED DUFOUR (Photo credit should read FRED DUFOUR/AFP/Getty Images) (credit:FRED DUFOUR via Getty Images)
FRANCE-BELGIUM-HISTORY-WAR-WWI-CENTENARY(31 of67)
Britain's Prince William and wife Catherine attend on August 4, 2014 in Liège, Belgium, commemorations marking 100 years since the invasion of Belgium by Germany at the start of World War I. World leaders leaders on Monday commemorated the 100th anniversary of the outbreak of World War I, a small Balkans conflict that went global with the German invasion of neutral Belgium in August 1914. AFP PHOTO / FRED DUFOUR (Photo credit should read FRED DUFOUR/AFP/Getty Images) (credit:FRED DUFOUR via Getty Images)
FRANCE-BELGIUM-HISTORY-WAR-WWI-CENTENARY(32 of67)
Britain's Prince William and wife Catherine attend on August 4, 2014 in Liège, Belgium, commemorations marking 100 years since the invasion of Belgium by Germany at the start of World War I. World leaders leaders on Monday commemorated the 100th anniversary of the outbreak of World War I, a small Balkans conflict that went global with the German invasion of neutral Belgium in August 1914. AFP PHOTO / FRED DUFOUR (Photo credit should read FRED DUFOUR/AFP/Getty Images) (credit:FRED DUFOUR via Getty Images)
FRANCE-BELGIUM-HISTORY-WAR-WWI-CENTENARY(33 of67)
Britain's Prince William and wife Catherine attend on August 4, 2014 in Liège, Belgium, commemorations marking 100 years since the invasion of Belgium by Germany at the start of World War I. World leaders leaders on Monday commemorated the 100th anniversary of the outbreak of World War I, a small Balkans conflict that went global with the German invasion of neutral Belgium in August 1914. AFP PHOTO / FRED DUFOUR (Photo credit should read FRED DUFOUR/AFP/Getty Images) (credit:FRED DUFOUR via Getty Images)
FRANCE-BELGIUM-HISTORY-WAR-WWI-CENTENARY(34 of67)
Britain's Prince William and wife Catherine attend on August 4, 2014 in Liege, Belgium, commemorations marking 100 years since the invasion of Belgium by Germany at the start of World War I. World leaders leaders on Monday commemorated the 100th anniversary of the outbreak of World War I, a small Balkans conflict that went global with the German invasion of neutral Belgium in August 1914. AFP PHOTO / FRED DUFOUR (Photo credit should read FRED DUFOUR/AFP/Getty Images) (credit:FRED DUFOUR via Getty Images)
World War I centenary(35 of67)
The Duke and Duchess of Cambridge are joined by French President Francois Hollande ahead of a ceremony at the Cointe Inter-allied Memorial, Liège, Belgium, commemorating the 100th anniversary of the start of the First World War. (credit:Gareth Fuller/PA Wire)
Belgium WWI Commemoration Ceremony(36 of67)
Attending a ceremony to commemorate the centenary of the start of the First World War, Britain's Duchess of Cambridge, at the Cointe Inter-allied Memorial, Liege, Belgium, commemorating the 100th anniversary of the start of the First World War, Monday Aug. 4, 2014. The ceremony pays homage to the victims of the First World War, both soldiers and civilians, from Belgium and abroad, who lost their lives on Belgian soil. (AP Photo / Chris Jackson, Pool) (credit:ASSOCIATED PRESS)
Prince Harry Attends The Unveiling Of The Folkestone Memorial Arch(37 of67)
FOLKESTONE, ENGLAND - AUGUST 04: Prince Harry attends the 'Step Short' commemorative event in Folkestone to mark the centenary of the First World War on August 4, 2014 in Folkestone, England. Monday 4th August marks the 100th anniversary of Great Britain declaring war on Germany. In 1914 British Prime Minister Herbert Asquith announced at 11pm that Britain was to enter the war after Germany had violated Belgium neutrality. The First World War or the Great War lasted until 11 November 1918 and is recognised as one of the deadliest historical conflicts with millions of causalities. A series of events commemorating the 100th anniversary are taking place throughout the day. (Photo by Anthony Harvey/Getty Images) (credit:Anthony Harvey via Getty Images)
The Duke & Duchess Of Cambridge Attend A Service Of Remembrance(38 of67)
LIEGE, BELGIUM - AUGUST 04: King Felipe of Spain attends a WW1 100 Years Commomoration Ceremony at Le Memorial Interallie on August 4, 2014 in Liege, Belgium. Monday 4th August marks the 100th Anniversary of Great Britain declaring war on Germany. In 1914 British Prime Minister Herbert Asquith announced at 11pm that Britain was to enter the war after Germany had violated Belgium's neutrality. The First World War or the Great War lasted until 11 November 1918 and is recognised as one of the deadliest historical conflicts with millions of casualties. A series of events commemorating the 100th Anniversary are taking place throughout the day. (Photo by Chris Jackson/Getty Images) (credit:Chris Jackson via Getty Images)
The Prince Of Wales Attends A Wreath Laying In George Square, Glasgow(39 of67)
GLASGOW, SCOTLAND - AUGUST 04: A general view during a wreath-laying ceremony at the cenotaph in Glasgow to commemorate the centenary of the start of World War One on August 4, 2014 in Glasgow, Scotland. Monday 4th August marks the 100thanniversary of Great Britain declaring war on Germany. In 1914 British Prime Minister Herbert Asquith announced at 11pm that Britain was to enter the war after Germany had violated Belgium neutrality. The First World War or the Great War lasted until 11 November 1918 and is recognised as one of the deadliest historical conflicts with millions of causalities. A series of events commemorating the 100th anniversary are taking place throughout the day. (Photo by Danny Lawson - WPA Pool /Getty Images) (credit:WPA Pool via Getty Images)
The Prince Of Wales Attends A Wreath Laying In George Square, Glasgow(40 of67)
GLASGOW, SCOTLAND - AUGUST 04: Protesters display a banner during a wreath-laying ceremony at the cenotaph in Glasgow to commemorate the centenary of the start of World War One on August 4, 2014 in Glasgow, Scotland. Monday 4th August marks the 100thanniversary of Great Britain declaring war on Germany. In 1914 British Prime Minister Herbert Asquith announced at 11pm that Britain was to enter the war after Germany had violated Belgium neutrality. The First World War or the Great War lasted until 11 November 1918 and is recognised as one of the deadliest historical conflicts with millions of causalities. A series of events commemorating the 100th anniversary are taking place throughout the day. (Photo by Danny Lawson - WPA Pool /Getty Images) (credit:WPA Pool via Getty Images)
The Prince Of Wales Attends A Wreath Laying In George Square, Glasgow(41 of67)
GLASGOW, SCOTLAND - AUGUST 04: Prince Charles, Prince Of Wales and Prime Minister David Cameron take the Salute at a wreath-laying ceremony at the cenotaph in Glasgow to commemorate the centenary of the start of World War One on August 4, 2014 in Glasgow, Scotland. Monday 4th August marks the 100thanniversary of Great Britain declaring war on Germany. In 1914 British Prime Minister Herbert Asquith announced at 11pm that Britain was to enter the war after Germany had violated Belgium neutrality. The First World War or the Great War lasted until 11 November 1918 and is recognised as one of the deadliest historical conflicts with millions of causalities. A series of events commemorating the 100th anniversary are taking place throughout the day. (Photo by Danny Lawson - WPA Pool /Getty Images) (credit:WPA Pool via Getty Images)
The Prince Of Wales Attends A Wreath Laying In George Square, Glasgow(42 of67)
GLASGOW, SCOTLAND - AUGUST 04: Prince Charles, Prince Of Wales attends a wreath-laying ceremony at the cenotaph in Glasgow to commemorate the centenary of the start of World War One on August 4, 2014 in Glasgow, Scotland. Monday 4th August marks the 100thanniversary of Great Britain declaring war on Germany. In 1914 British Prime Minister Herbert Asquith announced at 11pm that Britain was to enter the war after Germany had violated Belgium neutrality. The First World War or the Great War lasted until 11 November 1918 and is recognised as one of the deadliest historical conflicts with millions of causalities. A series of events commemorating the 100th anniversary are taking place throughout the day. (Photo by Danny Lawson - WPA Pool /Getty Images) (credit:WPA Pool via Getty Images)
The Duke & Duchess Of Cambridge Attend A Service Of Remembrance(43 of67)
LIEGE, BELGIUM - AUGUST 04: Francois Hollande shakes hands with King Philippe of Belgium takes part in a WW1 100 Years Commomoration Ceremony at Le Memorial Interallie on August 4, 2014 in Liege, Belgium. Monday 4th August marks the 100th Anniversary of Great Britain declaring war on Germany. In 1914 British Prime Minister Herbert Asquith announced at 11pm that Britain was to enter the war after Germany had violated Belgium's neutrality. The First World War or the Great War lasted until 11 November 1918 and is recognised as one of the deadliest historical conflicts with millions of casualties. A series of events commemorating the 100th Anniversary are taking place throughout the day. (Photo by Chris Jackson/Getty Images) (credit:Chris Jackson via Getty Images)
The Duke & Duchess Of Cambridge Attend A Service Of Remembrance(44 of67)
LIEGE, BELGIUM - AUGUST 04: Prince William, Duke of Cambridge and Catherine, Duchess of Cambridge share a joke with Francois Hollande as they attend a WW1 100 Years Commomoration Ceremony at Le Memorial Interallie on August 4, 2014 in Liege, Belgium. Monday 4th August marks the 100th Anniversary of Great Britain declaring war on Germany. In 1914 British Prime Minister Herbert Asquith announced at 11pm that Britain was to enter the war after Germany had violated Belgium's neutrality. The First World War or the Great War lasted until 11 November 1918 and is recognised as one of the deadliest historical conflicts with millions of casualties. A series of events commemorating the 100th Anniversary are taking place throughout the day. (Photo by Chris Jackson/Getty Images) (credit:Chris Jackson via Getty Images)
The Prince Of Wales Attends A Service Of Commemoration For The Commonwealth(45 of67)
GLASGOW, SCOTLAND - AUGUST 04: Prime Minister David Cameron attends a memorial service at Glasgow Cathedral to mark the centenary of the outbreak of World War One on August 4, 2014 in Glasgow, Scotland. Monday 4th August marks the 100thanniversary of Great Britain declaring war on Germany. In 1914 British Prime Minister Herbert Asquith announced at 11pm that Britain was to enter the war after Germany had violated Belgium neutrality. The First World War or the Great War lasted until 11 November 1918 and is recognised as one of the deadliest historical conflicts with millions of causalities. A series of events commemorating the 100th anniversary are taking place throughout the day. (Photo by Russell Cheyne - WPA Pool /Getty Images) (credit:WPA Pool via Getty Images)
The Duke & Duchess Of Cambridge Attend A Service Of Remembrance(46 of67)
LIEGE, BELGIUM - AUGUST 04: Prince William, Duke of Cambridge and Catherine, Duchess of Cambridge attend a WW1 100 Years Commomoration Ceremony at Le Memorial Interallie on August 4, 2014 in Liege, Belgium. Monday 4th August marks the 100th Anniversary of Great Britain declaring war on Germany. In 1914 British Prime Minister Herbert Asquith announced at 11pm that Britain was to enter the war after Germany had violated Belgium's neutrality. The First World War or the Great War lasted until 11 November 1918 and is recognised as one of the deadliest historical conflicts with millions of casualties. A series of events commemorating the 100th Anniversary are taking place throughout the day. (Photo by Chris Jackson/Getty Images) (credit:Chris Jackson via Getty Images)
The Duke & Duchess Of Cambridge Attend A Service Of Remembrance(47 of67)
LIEGE, BELGIUM - AUGUST 04: King Felipe of Spain and Francois Hollande shake hands as they attend a WW1 100 Years Commomoration Ceremony at Le Memorial Interallie on August 4, 2014 in Liege, Belgium. Monday 4th August marks the 100th Anniversary of Great Britain declaring war on Germany. In 1914 British Prime Minister Herbert Asquith announced at 11pm that Britain was to enter the war after Germany had violated Belgium's neutrality. The First World War or the Great War lasted until 11 November 1918 and is recognised as one of the deadliest historical conflicts with millions of casualties. A series of events commemorating the 100th Anniversary are taking place throughout the day. (Photo by Chris Jackson/Getty Images) (credit:Chris Jackson via Getty Images)
The Duke & Duchess Of Cambridge Attend A Service Of Remembrance(48 of67)
LIEGE, BELGIUM - AUGUST 04: German Prime Minister Joachim Gauck embraces Francois Hollande as they attend a WW1 100 Years Commomoration Ceremony at Le Memorial Interallie on August 4, 2014 in Liege, Belgium. Monday 4th August marks the 100th Anniversary of Great Britain declaring war on Germany. In 1914 British Prime Minister Herbert Asquith announced at 11pm that Britain was to enter the war after Germany had violated Belgium's neutrality. The First World War or the Great War lasted until 11 November 1918 and is recognised as one of the deadliest historical conflicts with millions of casualties. A series of events commemorating the 100th Anniversary are taking place throughout the day. (Photo by Chris Jackson/Getty Images) (credit:Chris Jackson via Getty Images)
The Duke & Duchess Of Cambridge Attend A Service Of Remembrance(49 of67)
LIEGE, BELGIUM - AUGUST 04: German Prime Minister Joachim Gauck embraces Francois Hollande as they attend a WW1 100 Years Commomoration Ceremony at Le Memorial Interallie on August 4, 2014 in Liege, Belgium. Monday 4th August marks the 100th Anniversary of Great Britain declaring war on Germany. In 1914 British Prime Minister Herbert Asquith announced at 11pm that Britain was to enter the war after Germany had violated Belgium's neutrality. The First World War or the Great War lasted until 11 November 1918 and is recognised as one of the deadliest historical conflicts with millions of casualties. A series of events commemorating the 100th Anniversary are taking place throughout the day. (Photo by Chris Jackson/Getty Images) (credit:Chris Jackson via Getty Images)
The Duke & Duchess Of Cambridge Attend A Service Of Remembrance(50 of67)
LIEGE, BELGIUM - AUGUST 04: Prince William, Duke of Cambridge and Catherine, Duchess of Cambridge attend a WW1 100 Years Commomoration Ceremony at Le Memorial Interallie on August 4, 2014 in Liege, Belgium. Monday 4th August marks the 100th Anniversary of Great Britain declaring war on Germany. In 1914 British Prime Minister Herbert Asquith announced at 11pm that Britain was to enter the war after Germany had violated Belgium's neutrality. The First World War or the Great War lasted until 11 November 1918 and is recognised as one of the deadliest historical conflicts with millions of casualties. A series of events commemorating the 100th Anniversary are taking place throughout the day. (Photo by Chris Jackson/Getty Images) (credit:Chris Jackson via Getty Images)
The Duke & Duchess Of Cambridge Attend A Service Of Remembrance(51 of67)
LIEGE, BELGIUM - AUGUST 04: Royals and heads of state attend a WW1 100 Years Commomoration Ceremony at Le Memorial Interallie on August 4, 2014 in Liege, Belgium. Monday 4th August marks the 100th Anniversary of Great Britain declaring war on Germany. In 1914 British Prime Minister Herbert Asquith announced at 11pm that Britain was to enter the war after Germany had violated Belgium's neutrality. The First World War or the Great War lasted until 11 November 1918 and is recognised as one of the deadliest historical conflicts with millions of casualties. A series of events commemorating the 100th Anniversary are taking place throughout the day. (Photo by Chris Jackson/Getty Images) (credit:Chris Jackson via Getty Images)
Chelsea Pensioners Take Part In The Great War Centenary Parade(52 of67)
LONDON, ENGLAND - AUGUST 4: Chelsea Pensioners join the Great War centenary parade of Edwardian cars as it crosses Westminster Bridge on August 4, 2014 in London, England. Monday 4th August marks the 100th anniversary of Great Britain declaring war on Germany. In 1914 British Prime Minister Herbert Asquith announced at 11 pm that Britain was to enter the war after Germany had violated Belgium neutrality. The First World War or the Great War lasted until 11 November 1918 and is recognised as one of the deadliest historical conflicts with millions of causalities. A series of events commemorating the 100th anniversary are taking place throughout the day. (Photo by Rob Stothard/Getty Images) (credit:Rob Stothard via Getty Images)
The Prince Of Wales Attends A Wreath Laying In George Square, Glasgow(53 of67)
GLASGOW, SCOTLAND - AUGUST 04: Scotland's First Minister Alex Salmond attends a wreath-laying ceremony at the cenotaph in Glasgow to commemorate the centenary of the start of World War One on August 4, 2014 in Glasgow, Scotland. Monday 4th August marks the 100thanniversary of Great Britain declaring war on Germany. In 1914 British Prime Minister Herbert Asquith announced at 11pm that Britain was to enter the war after Germany had violated Belgium neutrality. The First World War or the Great War lasted until 11 November 1918 and is recognised as one of the deadliest historical conflicts with millions of causalities. A series of events commemorating the 100th anniversary are taking place throughout the day. (Photo by Danny Lawson - WPA Pool /Getty Images) (credit:WPA Pool via Getty Images)
The Prince Of Wales Attends A Wreath Laying In George Square, Glasgow(54 of67)
GLASGOW, SCOTLAND - AUGUST 04: Prince Charles, Prince Of Wales and Prime Minister David Cameron take the Salute at a wreath-laying ceremony at the cenotaph in Glasgow to commemorate the centenary of the start of World War One on August 4, 2014 in Glasgow, Scotland. Monday 4th August marks the 100thanniversary of Great Britain declaring war on Germany. In 1914 British Prime Minister Herbert Asquith announced at 11pm that Britain was to enter the war after Germany had violated Belgium neutrality. The First World War or the Great War lasted until 11 November 1918 and is recognised as one of the deadliest historical conflicts with millions of causalities. A series of events commemorating the 100th anniversary are taking place throughout the day. (Photo by Danny Lawson - WPA Pool /Getty Images) (credit:WPA Pool via Getty Images)
Chelsea Pensioners Take Part In The Great War Centenary Parade(55 of67)
LONDON, ENGLAND - AUGUST 4: Chelsea Pensioners wave to members of the public as the Great War centenary parade of Edwardian cars crosses Westminster Bridge on August 4, 2014 in London, England. Monday 4th August marks the 100th anniversary of Great Britain declaring war on Germany. In 1914 British Prime Minister Herbert Asquith announced at 11 pm that Britain was to enter the war after Germany had violated Belgium neutrality. The First World War or the Great War lasted until 11 November 1918 and is recognised as one of the deadliest historical conflicts with millions of causalities. A series of events commemorating the 100th anniversary are taking place throughout the day. (Photo by Rob Stothard/Getty Images) (credit:Rob Stothard via Getty Images)
World War I centenary - Glasgow(56 of67)
Prime Minister David Cameron reads a passage during a service for the Commonwealth to commemorate the 100th anniversary of the outbreak of World War One. (credit:Russell Cheyne/WPA-Rota)
World War I centenary - Glasgow(57 of67)
Prime Minister David Cameron reads a passage during a service for the Commonwealth to commemorate the 100th anniversary of the outbreak of World War One. (credit:Russell Cheyne/PA Wire)
World War I centenary - Belgium(58 of67)
(left to right) The Duke and Duchess of Cambridge, French President Francois Hollande, Queen Mathilde of Belgium, her husband King Philippe and German President Joachim Gauck during ceremony at the Cointe Inter-allied Memorial, Liege, Belgium, commemorating the 100th anniversary of the start of the First World War. (credit:John Thys/WPA-Rota)
World War I centenary - Glasgow(59 of67)
A wreath-laying ceremony at the cenotaph in Glasgow to commemorate the centenary of the start of the First World War. (credit:Danny Lawson/PA Wire)
World War I centenary - Glasgow(60 of67)
Scotland's First Minister Alex Salmond sits behind Prime Minister David Cameron, Deputy Prime Minister Nick Clegg and the Leader of )pposition Ed Miliband during a service for the Commonwealth to commemorate the 100th anniversary of the outbreak of World War One. (credit:Russell Cheyne/PA Wire)
World War I centenary - London(61 of67)
A blue Sunbeam car passes over Westminster Bridge in central London as part of the Great War Centenary Parade in central London. (credit:John Stillwell/PA Wire)
World War I centenary - Glasgow(62 of67)
The Prince of Wales during a service for the Commonwealth to commemorate the 100th anniversary of the outbreak of World War One. (credit:Russell Cheyne/PA Wire)
World War I centenary - Glasgow(63 of67)
The Prince of Wales, Prime Minister David Cameron, Deputy Prime Minister Nick Clegg and Labour leader Ed Miliband during a wreath-laying ceremony at the cenotaph in Glasgow to commemorate the centenary of the start of the First World War. (credit:Danny Lawson/PA Wire)
Britain's Prime Minister David Cameron bows after reading a passage during a service for the Commonwealth to commemorate the 100th anniversary of the outbreak of World War One, in Glasgow Cathedral, in Glasgow(64 of67)
Britain's Prime Minister David Cameron bows after reading a passage during a service for the Commonwealth to commemorate the 100th anniversary of the outbreak of World War One (WW1), in Glasgow Cathedral, in Glasgow, Scotland August 4, 2014. REUTERS/Russell Cheyne (BRITAIN - Tags: SOCIETY RELIGION ANNIVERSARY CONFLICT) (credit:RUSSELL CHEYNE/WPA Rota)
Britain's Prime Minister David Cameron reads a passage during a service for the Commonwealth to commemorate the 100th anniversary of the outbreak of World War One, in Glasgow Cathedral, in Glasgow(65 of67)
Britain's Prime Minister David Cameron reads a passage during a service for the Commonwealth to commemorate the 100th anniversary of the outbreak of World War One (WW1), in Glasgow Cathedral, in Glasgow, Scotland August 4, 2014. REUTERS/Russell Cheyne (BRITAIN - Tags: SOCIETY RELIGION ANNIVERSARY CONFLICT) (credit:RUSSELL CHEYNE/WPA Rota)
World War I centenary - London(66 of67)
A 1913 Rolls Royce passes over Westminster Bridge in central London as part of the Great War Centenary Parade in central London. (credit:John Stillwell/PA Wire)
World War I centenary - Glasgow(67 of67)
Chancellor of the Exchequer George Osborne stands behind the First Minister of Scotland Alex Salmond, as they leave a service for the Commonwealth to commemorate the 100th anniversary of the outbreak of World War One. (credit:Russell Cheyne/WPA-Rota)