 Complete the following phrase:  In 1941 ZG 26 served again with success in the German invasion of Yugoslavia and Battle of Greece and then Battle of Crete in April and May. From June 1941, the bulk of ZG 26 fought on the Eastern Front from Operation Barbarossa which began the war on the Soviet Union. ZG 26 supported Army Group Centre and Army Group North. A group of ZG 26 flew and served in the 