Arsenal whizkid Hector Bellerin was thrown in at the deep end by Arsene Wenger, and only just about kept afloat by a profligate Dortmund.
The German side had 23 shots on goal, landing only seven on target and scoring with two - a heavier defeat would likely have been a game the Spaniard would be adversely affected by.
The 19-year-old was making his first ever competitive start for Arsenal, due to an injury sustained by Mathieu Debuchy at the weekend.
Bellerin, who had spoken ahead of the game of his confidence, took to Twitter after the game to insist the opportunity to play was a 'dream' even though he was clearly disappointed with the result.
Gutted for the result and the performance, but on the other hand, a dream came true for me tonight! Thanks everyone for yor support! #AFC— Hector Bellerin (@HectorBellerin) September 16, 2014
Bellerin unfortunately was handed a raw deal, with only Mesut Ozil protecting his right side, Arsenal's lack of a top class defensive midfielder was once again exposed.
They can get away without one for Premier League games against the likes of Crystal Palace and may be even Aston Villa this coming weekend, but at the highest level, a team as talented as Borussia Dortmund can badly expose the glaring flaw.