American submarine USS Swordfish destroyed four Japanese ships according to the U.S. Joint Intelligence Committee. Daily summary dated 9 January 1942

An item reported that the American submarine USS Swordfish returned from patrolling. She sunk 3 Japanese cargo ships of around 10,000 tons and one transport.

Source

Map Room Papers (Roosevelt Administration), 1942 - 1945. U.S. Joint Intelligence Committee. Daily summary No. 30 dated 9 January 1942