So, Battle of Britain, London, campaign. Got through the first 2 missions, the next is "Protect your wingmen", but I can't complete it. Have tried killing the enemy/asking wingmen to attack/defend/formation/have tried running away but it hardly gives me anytime to do any of these before telling me the mission has failed. What exactly is the objective? How do I protect my wingmen?!?!?!?! Any advise much appreciated.