The Battle of Berlin, designated the Berlin Strategic Offensive Operation by the Soviet Union, was the final major offensive of the European theatre of World War II. Following the Vistula–Oder Offensive of January–February 1945, the Red Army had temporarily halted on a line 60 km (37 mi) east of Berlin. When the offensive resumed on 16 April, two Soviet fronts (army groups) attacked Berlin from the east and south, while a third overran German forces positioned north of Berlin.