 Complete the following phrase:  During the tumultuous years that followed in China, Isabel served as a member of the patrol and as its flagship, charged with protecting American commerce from pirates. Based at Shanghai, Isabel spent the low-water period on the river at Hankow, returning to the coast in the summer. She and the other small gunboats of the U.S. Navy in China performed the arduous task of protecting American interests during numerous incidents and threats to American nationals. On many occasions the ship came under fire, as in October 1926 when she was caught between the rifle fire of opposing Chinese armies on the Yangtze. Isabel also took part in the 