Less than two years later, Nazi Germany attacked the Soviet Union. The invasion, known as Operation Barbarossa, began on June 22, 1941, and by September, the occupied territory was divided between two brand new German administrative units, the District of Galicia of the Nazi General Government and the Reichskommissariat Ukraine stretching all the way to Donbas by 1943.[1] Ukrainians who chose to resist and fight German occupation forces joined the Red Army or the irregulars.