[9] Nevertheless when the USSR was attacked by Nazi Germany in June, some form of anti-Axis resistance started, with the emergence of Macedonian Partisan military units.[11] The role of the Bulgarian communists, which avoided organizing mass armed resistance in the area, was also a key factor.[13] To change that, in the beginning of 1943 the Montenegrin Svetozar Vukmanović-Tempo was sent by Tito as an assistant to the HQ of the Macedonian partisan forces.As result the Communist Party of Macedonia (CPM) was formed on 19 March 1943 in Tetovo, then in the Italian occupation zone.[15] The date of the creation of its major unit, the Mirče Acev Battalion, on August 18, 1943 on Mount Slavej[16][page needed] between Ohrid and Kičevo, then in the Italian occupation zone, is officially celebrated today in North Macedonia as the Day of the Army of the Republic of North Macedonia.
Formation of the 51st Division in Shirok Dol, October 1944.
Partisans of the 4th Macedonian Brigade in August 1944.