An extraordinary man
Lieutenant Edouard Victor Michael Isaacs, U.S. Navy, was captured on May 31, 1918, by the Germans when the submarine U-90 sent three torpedoes into his ship, the U.S.S. President Lincoln. During his captivity, Isaacs studied German submarine tactics and equipment. Isaacs eventually escaped and gave vital information about German submarines to the Allies. He was awarded the Medal of Honor for his heroic actions.
National Archives, Records of the Bureau of Ships