Originally posted by Ike 2K#
did Bf-109 F-4 enter service during the Battle of Brittain or after the Battle of Brittain?
109F-0 10 for evaluation in July 1940
109F-1 First production operational service Jan 1941
109F-2 15mm cannon Jan 1942
Was therefore operational after BoB but was the main fighter during Barbarossa - Invasion of Russia in 1941.