IL2 Birds of Prey: Hints, Tips, and FAQ's Thread

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I hope this is the right place to ask a dumb question. Especially for a first post.
I am on the last Battle of Stalingrad mission 'Hornets Nest' (on the PS3). No matter how quickly I shoot down the German aircraft I get "mission Failed..." when I have 2 or 3 aircraft left.

I am using the map to go and intercept the closest flight of aircraft. I then select one of them and set the attack order for my wingmen and then attack the other four and then come back to finish off those that my wingmen have left. I then give the 'regroup' order then go to the nearest flight of German aircraft and start the process of ordering my wingmen to attack one while I attack one of the next wing of four.

What am I doing wrong guys?
TIA.