During the German-Soviet War (June 1941–May 1945), the 369th Croatian Reinforced Infantry Regiment (a unit of Germany′s 100th Jäger Division of the German Army, under Croatian officers Viktor Pavičić and later Marko Mesić) distinguished itself in the Battle of Stalingrad, but surrendered along with the German 6th Army in early February 1943. At the end of the war in Europe, units of the Red Army′s 3rd Ukrainian Front fought in some Croat-populated territories, then mostly outside the borders of the pro-Germany Independent State of Croatia (the NDH). On the day Germany attacked the Soviet Union, 22 June 1941, the Communist Party of Yugoslavia (CPY) received orders from the Moscow-based Comintern to come to the Soviet Union′s aid and on the same day, Croatian communists set up the 1st Sisak Partisan Detachment, the first armed anti-fascist guerrila unit formed in occupied Yugoslavia during World War II. From July 1941, Tito's Yugoslav Partisans, supported by the USSR, fought against Germany, the NDH, and allies thereof, as well as Chetniks. In November 1944, during the Battle of Batina (now in Croatia), 1,237 men of the Red Army were killed fighting against the combined Axis forces. On the other hand, the 1st Cossack Cavalry Division and the 2nd Cossack Cavalry Division merged into the XV SS Cossack Cavalry Corps in February 1945 under German command and manned mainly by Cossacks from the USSR, from 1943 conducted successful tactical operations in Croatia against both Communist guerrilas and — from late 1944 — the Red Army. Also fighting on the territory of the NDH from October 1944 — against the Communist partisans and the Soviet troops — were the retreating units of the Russian Protective Corps, whose commander, Russian general Boris Shteifon, died in Zagreb on 30 April 1945.