 Complete the following phrase:  During Nazi Germanys Operation Barbarossa against the Soviet Union in June 1941, the German forces quickly overran the eastern half of Poland controlled by the Red Army since 1939. New Reichskommissariats were formed across the Kresy macroregion. As the Soviet-German war progressed, the Home Army fought against both invaders, including the Soviet partisans, who often considered the Polish underground as enemies on a par with the Germans and from June 1943 were authorized by their command to denounce them to the Nazis. Due to the intensified, by the fall of 1943, warfare between the Home Army and the Soviet partisans in Poland, a few Polish commanders accepted weapons and ammunition from the Germans to fight the communist forces. In 1944, the Germans clandestinely armed some regional AK units operating in the areas of Navahrudak and Vilnius. This AK-Nazi cooperation was condemned by General Kazimierz Sosnkowski, commander-in-chief in the Polish Government-in-Exile, who ordered the responsible officers court-martialed. The AK turned these weapons against the Nazis during the 