In Vardar Macedonia, after the Bulgarian coup d'état of 1944, the Bulgarian troops, surrounded by German forces, fought their way back to the old borders of Bulgaria. Under the leadership of the new Bulgarian pro-Soviet government, four armies, 455,000 strong in total, were mobilised and reorganised. Most of them re-entered occupied Yugoslavia in early October 1944 and moved from Sofia to Niš, Skopje and Pristina with the strategic task of blocking the German forces withdrawing from Greece. The Bulgarian army would reach the Alps in Austria, participating in the expulsion of the Germans to the west, through Yugoslavia and Hungary.