Carlos Vela, Bacary Sagna and Samir Nasri found the net before Celtic hit back with late goals as Arsenal won the Emirates Cup with a 3-2 win.
It took Theo Walcott, who looked fresh from a summer's rest, just three minutes to open up the Celtic defence as Vela swept the Gunners into the lead.
Arsenal doubled their advantage just before half-time when Celtic failed to clear a corner and full-back Sagna blasted an 18-yard angled drive inside the near post, before substitute Samir Nasri swept the Gunners into a 3-0 lead on 51 minutes following more good work by Walcott down the right.
Jack Wilshere, who produced an all-action display which was almost capped by a goal when his stunning first-half volley smashed against the crossbar, showed his inexperience by wrestling Celtic substitute Fortune to the floor in the penalty area on 69 minutes, but was let off when former Manchester City striker Georgios Samaras ballooned his spot-kick over the crossbar.
Manuel Almunia, who had not had much to do, pulled off a fine one-handed save to deny Efrain Juarez, but was beaten on 73 minutes when Daryl Murphy, a summer signing from Sunderland, knocked the ball in after it rebounded across the six-yard box.
The Arsenal goalkeeper denied Murphy when, with eight minutes left, the reshuffled home defence was opened up again, before Ki Sung-yueng eventually made it 3-2 with a close-range effort.