A 17th-minute strike from Mohammad Dabre and an own goal from Kido Taylor-Hart cancelled out Joel Ideho's equaliser to hand Swindon Town all three points in the opening game of EFL Trophy Southern Group F on Tuesday night.
The Gunners started the game brightly, nicking the ball from goalkeeper Lewis Ward on the edge of the box before Mika Biereth fashioned a good chance for himself - spinning in-behind down the right channel and hitting the post from close range.
After surviving the early scare it was Ben Garner's side who took the lead. Alex Gilbert crossed from the left after a favourable deflection put the ball into his path and Dabre was quick to stick out a leg and bundle the ball home.