April 1942 – Battle of the Atlantic
With the USA’s entry into the war, the U-Boat campaign off the American coastline continues to score important successes.
The loss of oil tankers is especially worrying as fuel is so important to the British war effort. At the beginning of April a partial convoy system was enacted off the East Coast of the US. The number of Halifax-UK convoys has to be curtailed so that more British and Canadian convoy escorts can be sent to join the US forces defending East Coast convoys. Axis submarines sink 74 ships during the month out of a total Allied loss of 132 ships totalling 674,000 tons. Only seven ships are sunk in the Pacific while in the Indian Ocean ships totalling 150,000 tons are lost largely because of the foray by Japanese carriers earlier in the month.