World War II: Allied forces launch the first of four assaults on Monte Cassino with the intention of breaking through the Winter Line and seizing Rome, an effort that would ultimately take four months and cost 105,000 Allied casualties.
The Allies, later known formally as the United Nations, were an international military coalition formed during the Second World War (1939–1945) to oppose the Axis powers, led by Nazi Germany, the Empire of Japan, and Fascist Italy. Its principal members by 1941 were the United Kingdom, United States, Soviet Union, and China.
