 Complete the following phrase:  The remainder of the 19th century would be a period of declining strength and introspection about the mission of the Marine Corps. The Navys transition from sail to steam put into question the need for Marines on naval ships; indeed, the replacement of masts and rigging with smokestacks literally left Marine marksmen without a place. However, the Marines would serve as a convenient resource for interventions and landings to protect U.S. lives and property in foreign countries, such as the expedition to Formosa in 1867. In June 1871, 651 Marine deployed for the expedition to Korea and made a landing at Ganghwa Island in which six Marines earned the Medal of Honor and one was killed landings were also taken by the French in 1866 and Japanese in 1875, 79 years before the famed 