Adding to the RAF's problems is a battle between the commanding officers of 11 Group, Keith Park (Trevor Howard), and 12 Group, Trafford Leigh-Mallory (Patrick Wymark). 12 Group is tasked with protecting 11 Group's airfields while 11 Group meets the enemy, but in raid after raid 12 Group aircraft are nowhere to be seen. Called to meet Dowding, Leigh-Mallory explains that the "Big Wing" tactic takes time for form up, while Park complains that the tactic simply is not working. Dowding ends the debate noting a critical shortage of pilots, wearily remarking, "We're fighting for survival, and losing."