December 16, 1941 – US submarine Swordfish was credited with the first confirmed sinking of a Japanese ship in the Pacific War. Following shakedown and post-shakedown repairs at Mare Island, Swordfish operated out of San Diego, California, until early 1941, when she set sail for Pearl Harbor. On 3 November, Swordfish, in company with three other U.S. submarines, departed Pearl, and on 22 November, arrived at Manila, Philippine Islands. The submarine remained at Manila until the Japanese attack on Pearl Harbor on 7 December 1941. The following day, she set sail on her first war patrol, conducted off the coast of Hainan, China. After damaging several enemy vessels on the 9th, 11th, and 14th, Swordfish sank her initial victim of the war on 16 December. Hit amidships by one of three torpedoes, the cargo ship Atsutasan Maru erupted in a cloud of smoke and flames and disappeared beneath the waves.