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after Britain lost Hong Kong, the closest Allied power to the territory was its original owner China. Then there was Hong Kong's status as a port. Any mainland port that touched the Pacific attracted the attention of the USN, because it was in its interest that China continued to keep the bulk of the Japanese Army occupied on the continent while the U.S. seized Japan's possessions in the Pacific. Hence, Allied commanders like Admiral Ernest King, the USN's highest-ranking officer and a member of the Joint Chiefs of Staff (JCS), thought that the U.S. had a major responsibility to help keep China in the war,
In 1943, China was tying down 20 per cent of the Japanese Army. No major fighting had occurred there for a while, but the Allies knew that this relative calm might not last. The fear that Japan would resume her efforts to knock China out of the war was real, and Allied planners wanted to prevent this by keeping the Chinese Army (of the Nationalist government) battle-worthy. To do this, they had to establish and maintain secure lines of communication (LoC) into China. As Japan had already occupied China's ports and the lone road into China from Burma (the Burma Road), the sole means of supplying China was through a risky, costly, and feeble air route over the Himalayas (the Hump).
The best method of supplying China was to recapture a port on the China Coast and establishing LoC to the interior of China. Initially, the Chinese Army was allotted the bulk of this task - if it could be strengthened by deliveries over the Hump and (if the Allies could retake it) the Burma Road. But by 1943, supplies over the Hump remained minuscule, the Burma Road was not reopened, and the Chinese (Nationalists, Communists, and third-party elements) preferred to fight among themselves rather than against the Japanese. With the Allied drives in the Pacific gathering momentum, the main responsibility for a campaign to recapture a port on the China Coast eventually fell to the U.S.
Hong Kong and Shanghai have long been the two best ports on the China Coast, with each possessing excellent harbour facilities. But Hong Kong rated ahead of Shanghai as the initial port to be opened up in China because of the strong Japanese presence around Shanghai. In the Hong Kong-Canton area during 1943, the Japanese still occupied only a beachhead. As long as Hong Kong remained a beachhead, and the Chinese forces ringing it maintained a measure of resolve, Japanese