The last Soviet campaign of the war in the European theater, which led to the fall of Berlin and the end of the war in Europe with the surrender of all German forces to the Allies. The three Soviet Fronts involved in the campaign had altogether 2.5 million men, 6,250 tanks, 7,500 aircraft, 41,600 artillery pieces and mortars, 3,255 truck-mounted Katyusha rocket launchers (nicknamed "Stalin Organs" by the Germans), and 95,383 motor vehicles. The campaign started with the battle of Oder-Neisse.