When Winston Churchill became prime minister in May 1940, Great Britain was alone. The British had won no meaningful battles and had no important allies. They had entered the war to support Poland, a cause that seemed lost. Nazi Germany and its Soviet ally dominated the continent. The Soviet Union had invaded Finland in November 1939, beginning with a bombing of Helsinki. Right after Churchill assumed office, the Soviet Union occupied and annexed the three Baltic states of Estonia, Latvia, and Lithuania.
