Tony wasn't doing as well as he'd like to admit. The fact that he had gotten less than ten hours of sleep total this past week combined with the hangover from last night's drinking had left him extremely ill prepared for the days mission.
The team had split up after they met in the middle of the city to go over the plan. Tony hadn't been paying attention when Fury had told them where they were being sent, so he really had no idea where they were.
Basically the only thing he knew about this mission was that they were going after terrorists, and that was only because Steve had told him that on the drive here.
It took about a half hour before had the team had successfully and unintentionally found and provoked the terrorists. All it took was the whole team standing right in front of them and the guys were attacking full force.
Bruce had stayed behind on the hovercraft to avoid bringing out the big guy, and all the Avengers were fitted with microphone headsets so they could keep in touch.