Eastern Fleet - Background

Background

Until World War II, the Indian Ocean had been a British "lake". It was ringed by significant British and Commonwealth possessions and much of the strategic supplies needed in peace and war had to pass across it: Persian oil, Malayan rubber, Indian tea, Australian and New Zealand foodstuffs. Britain also utilised Australian and New Zealand manpower; hence, safe passage for British cargo ships was critical.

At the outbreak of World War II, the German Navy (Kriegsmarine) used auxiliary cruisers (converted merchant ships) and the Pocket Battleship Graf Spee to threaten the sea lanes and tie down the Royal Navy. In mid-1940, Italy declared war and the Italian vessels based in Italian East Africa posed a threat to the supply routes through the Red Sea. Worse was to come when the Japanese declared war in December 1941 and, after Pearl Harbor, the sinking of Prince of Wales and Repulse, and the occupation of Malaya, Singapore, and the Dutch East Indies, there was an aggressive threat from the east.

This became reality when an overwhelming Japanese naval force operated in the eastern Indian Ocean, sinking an aircraft carrier, other warships and disrupting freight traffic along the Indian east coast. At this stage, the Chief of the Imperial General Staff, General Sir Alan Brooke wrote:

We were hanging by our eyelids! Australia and India were threatened by the Japanese, we had temporarily lost control of the Indian Ocean, the Germans were threatening Iran and our oil, Auchinleck was in precarious straits in the desert, and the submarine sinkings were heavy.