Help with BoB "Defend a Friendly" Single Mission
 

Can anyone give me help on how to beat this Battle of Britian mission? I've tried LOTS of times, and am not sure what I am doing wrong. On one occasion I cleared all the enemy 109s out of the sky and it still told me I failed.

Any help would be greatly appreciated...

Sorry about the new thread. I just tried again and finished it!!! I guess I wasn't sticking close enough to the guy I was defending.

No worries. Off to the next mission...