International Battles, Wars, Conflicts and Treaties

Neville Chamberlain was Prime Minister of Great Britain in September 1939 at the start of World War II. In May 1940, after the disastrous Norwegian campaign, Chamberlain resigned and Winston Churchill became prime minister.

The country was part of the Triple Alliance between 1883 and 1914 (initially Germany, Austria-Hungary and Russia, later also Italy and Romania) under which the Central Powers operated during World War I (WWI), but it changed sides in 1916 and became a member of the Entente.