The Battle of Singapore, also known as the Fall of Singapore, was fought in the South-East Asian theatre of World War II when the Empire of Japan invaded the British stronghold of Singapore—nicknamed the "Gibraltar of the East". Singapore was the major British military base in South-East Asia and was the keystone of British imperial interwar defence planning for South-East Asia as well as the South-West Pacific. The fighting in Singapore lasted from 8 to 15 February 1942 although this was preceded by two months of British resistance as Japanese forces advanced down the Malaya peninsula.