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Arsenal recorded their 11th consecutive away win at West Brom following a penalty shootout triumph in the Capital One Cup.
Nine months on from their chastening quarter-final defeat to Bradford from 12 yards the Gunners' second-string feared a similar fate when Serge Gnabry had his penalty saved by Luke Daniels.
But misses from Craig Dawson and Albion substitute Morgan Amalfitano allowed Nacho Monreal to strike the decisive kick for a 4-3 shootout win.
West Brom-Arsenal penalties
FBL-ENG-LCUP-WEST BROM-ARSENAL(01 of13)
Arsenal's Spanish defender Nacho Monreal scores the winning penalty during the League Cup football match between West Bromwich Albion and Arsenal at The Hawthorns in West Bromwich on September 25, 2013. Arsenal won 4-3 on penalties. AFP PHOTO/ IAN KINGTON - RESTRICTED TO EDITORIAL USE. NO USE WITH UNAUTHORIZED AUDIO, VIDEO, DATA, FIXTURE LISTS, CLUB/LEAGUE LOGOS OR LIVE SERVICES. ONLINE IN-MATCH USE LIMITED TO 45 IMAGES, NO VIDEO EMULATION. NO USE IN BETTING, GAMES OR SINGLE CLUB/LEAGUE/PLAYER PUBLICATIONS. (Photo credit should read IAN KINGTON/AFP/Getty Images) (credit:Getty Images)
West Bromwich Albion v Arsenal - Capital One Cup(02 of13)
WEST BROMWICH, ENGLAND - SEPTEMBER 25: Arsenal players celebrate after teammate Nacho Monreal scores the match winning penalty during the Capital One Cup third round match between West Bromwich Albion and Arsenal at The Hawthorns on September 25, 2013 in West Bromwich, England. (Photo by Jamie McDonald/Getty Images) (credit:Getty Images)
West Bromwich Albion v Arsenal - Capital One Cup(03 of13)
WEST BROMWICH, ENGLAND - SEPTEMBER 25: Arsenal players celebrate after teammate Nacho Monreal scores the match winning penalty during the Capital One Cup third round match between West Bromwich Albion and Arsenal at The Hawthorns on September 25, 2013 in West Bromwich, England. (Photo by Jamie McDonald/Getty Images) (credit:Getty Images)
West Bromwich Albion v Arsenal - Capital One Cup(04 of13)
WEST BROMWICH, ENGLAND - SEPTEMBER 25: A dejected Morgan Amalfitano of West Bromwich Albion walks back to his teammates after missing his penalty kick during the Capital One Cup third round match between West Bromwich Albion and Arsenal at The Hawthorns on September 25, 2013 in West Bromwich, England. (Photo by Jamie McDonald/Getty Images) (credit:Getty Images)
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Arsenal's Japanese midfielder Ryo Miyachi (R) and teammates watch the penalties and Arsenal win 4-3 on penalties during the League Cup football match between West Bromwich Albion and Arsenal at The Hawthorns in West Bromwich on September 25, 2013. Arsenal won 4-3 on penalties. AFP PHOTO/ IAN KINGTON - RESTRICTED TO EDITORIAL USE. NO USE WITH UNAUTHORIZED AUDIO, VIDEO, DATA, FIXTURE LISTS, CLUB/LEAGUE LOGOS OR LIVE SERVICES. ONLINE IN-MATCH USE LIMITED TO 45 IMAGES, NO VIDEO EMULATION. NO USE IN BETTING, GAMES OR SINGLE CLUB/LEAGUE/PLAYER PUBLICATIONS. (Photo credit should read IAN KINGTON/AFP/Getty Images) (credit:Getty Images)
West Bromwich Albion v Arsenal - Capital One Cup(06 of13)
WEST BROMWICH, ENGLAND - SEPTEMBER 25: Chuba Akpom of Arsenal celebrates after teammate Nacho Monreal scores the match winning penalty during the Capital One Cup third round match between West Bromwich Albion and Arsenal at The Hawthorns on September 25, 2013 in West Bromwich, England. (Photo by Jamie McDonald/Getty Images) (credit:Getty Images)
FBL-ENG-LCUP-WEST BROM-ARSENAL(07 of13)
Arsenal's Spanish defender Nacho Monreal (C) celebrates scoring his penalty and Arsenal win 4-3 on penalties during the League Cup football match between West Bromwich Albion and Arsenal at The Hawthorns in West Bromwich on September 25, 2013. Arsenal won 4-3 on penalties. AFP PHOTO/ IAN KINGTON - RESTRICTED TO EDITORIAL USE. NO USE WITH UNAUTHORIZED AUDIO, VIDEO, DATA, FIXTURE LISTS, CLUB/LEAGUE LOGOS OR LIVE SERVICES. ONLINE IN-MATCH USE LIMITED TO 45 IMAGES, NO VIDEO EMULATION. NO USE IN BETTING, GAMES OR SINGLE CLUB/LEAGUE/PLAYER PUBLICATIONS. (Photo credit should read IAN KINGTON/AFP/Getty Images) (credit:Getty Images)
West Bromwich Albion v Arsenal - Capital One Cup(08 of13)
WEST BROMWICH, ENGLAND - SEPTEMBER 25: Nacho Monreal (2nd L) of Arsenal is congratulated by teammates Chuba Akpom (L), Hector Bellerin (2nd R) and Kristoffer Olsson (R) after scoring the match winning penalty during the Capital One Cup third round match between West Bromwich Albion and Arsenal at The Hawthorns on September 25, 2013 in West Bromwich, England. (Photo by Jamie McDonald/Getty Images) (credit:Getty Images)
FBL-ENG-LCUP-WEST BROM-ARSENAL(09 of13)
Arsenal's Spanish defender Nacho Monreal (C) celebrates scoring his penalty during the League Cup football match between West Bromwich Albion and Arsenal at The Hawthorns in West Bromwich on September 25, 2013. Arsenal won 4-3 on penalties. AFP PHOTO/ IAN KINGTON - RESTRICTED TO EDITORIAL USE. NO USE WITH UNAUTHORIZED AUDIO, VIDEO, DATA, FIXTURE LISTS, CLUB/LEAGUE LOGOS OR LIVE SERVICES. ONLINE IN-MATCH USE LIMITED TO 45 IMAGES, NO VIDEO EMULATION. NO USE IN BETTING, GAMES OR SINGLE CLUB/LEAGUE/PLAYER PUBLICATIONS. (Photo credit should read IAN KINGTON/AFP/Getty Images) (credit:Getty Images)
West Bromwich Albion v Arsenal - Capital One Cup(10 of13)
WEST BROMWICH, ENGLAND - SEPTEMBER 25: Arsenal players celebrate after teammate Nacho Monreal scores the match winning penalty during the Capital One Cup third round match between West Bromwich Albion and Arsenal at The Hawthorns on September 25, 2013 in West Bromwich, England. (Photo by Jamie McDonald/Getty Images) (credit:Getty Images)
West Bromwich Albion v Arsenal - Capital One Cup(11 of13)
WEST BROMWICH, ENGLAND - SEPTEMBER 25: Arsenal players look on anxiously as the penalty shoot out commences during the Capital One Cup third round match between West Bromwich Albion and Arsenal at The Hawthorns on September 25, 2013 in West Bromwich, England. (Photo by Jamie McDonald/Getty Images) (credit:Getty Images)
West Bromwich Albion v Arsenal - Capital One Cup(12 of13)
WEST BROMWICH, ENGLAND - SEPTEMBER 25: Serge Gnabry #44 of Arsenal looks on after missing a penalty during the Capital One Cup third round match between West Bromwich Albion and Arsenal at The Hawthorns on September 25, 2013 in West Bromwich, England. (Photo by Jamie McDonald/Getty Images) (credit:Getty Images)
West Bromwich Albion v Arsenal - Capital One Cup(13 of13)
WEST BROMWICH, ENGLAND - SEPTEMBER 25: Arsenal players celebrate after teammate Nacho Monreal scores the match winning penalty during the Capital One Cup third round match between West Bromwich Albion and Arsenal at The Hawthorns on September 25, 2013 in West Bromwich, England. (Photo by Jamie McDonald/Getty Images) (credit:Getty Images)
Arsène Wenger fielded several young players inexperienced at this level, such as 20-year-old first-time starter Eisfeld, debutant Isaac Hayden, Kris Olsson - another making his senior bow - and Chuba Akpom, with the latter pair coming off the bench and scoring in the shoot-out.
Arsenal will host Chelsea in round four, and Wenger said: "I am proud. We played with many young players and they showed they are not only good footballers but that they can fight as well.
"I decided to go for young players with the penalties and they coped well with the pressure."