'Kampfgeschwader' 27 Boelcke was a Luftwaffe medium bomber wing of World War II. Formed in May 1939, KG 27 first saw action in the German invasion of Poland in September 1939. During the Phoney War—September 1939 – April 1940—the bomber wing flew armed reconnaissance missions over France. In May 1940 it fought in the Battle of Belgium and Battle of France through to the end of the campaigns in June 1940.