United States in World War I
On April 7, 1917, the scuttling by her crew of SMS "Cormoran", a German merchant raider that had been held in Apra Harbor for two years, was the first violent action of the United States in World War I, first shots fired by the U.S. against Germany in WWI, the first German prisoners of war captured by the U.S., and the first Germans killed in action by the U.S. in WWI