The new Bulgarian People's Army and the Red Army 3rd Ukrainian Front troops were concentrated at the old Bulgarian-Yugoslav border. At the dawn of October 8th, they entered Yugoslavia from the south. The First and Fourth Bulgarian Armies invaded Vardar Macedonia, and the Second Army south-eastern Serbia. The First Army then swung north with the Soviet 3rd Ukrainian Front, through eastern Yugoslavia and south-western Hungary, before linking up with the British 8th Army in Austria in May 1945.
