English: U.S. Marines from U.S. Marine Corps Detachment Cavite embark on trucks after arriving in Shanghai on 20 August 1937 after arriving from Manila on SS President Hoover. These troops were the first U.S. reinforcements in large numbers for the 4th Marine Regiment which had the task of defending the U.S. ("C") Sector of the International Settlement from possible harm during the Sino-Japanese fighting there in the summer of 1937.