The Japanese surprise attack on Pearl Harbor on 7 December 1941 is extremely well known, but far fewer people know that the Japanese also attacked British and US warships at Shanghai without declaring war. This took place on the same day, although it was 8 December in Shanghai because it was on the other side of the International Date Line.
Britain and the USA both then maintained small naval forces on the Yangtze River in order to protect their interests in China. These included the Shanghai International Settlement, an autonomous district of the city inhabited by Westerners. It was originally protected by British soldiers, US Marines and Royal Navy and United States Navy gunboats, but most of these had been withdrawn by December 1941.
Japan and China had been at war with each other since 1937, when China began to fully resist Japanese encroachments into her territory that…
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