American submarine sunk 2 Japanese merchant ships in east China Sea according to the U.S. Joint Intelligence Committee. Daily summary dated 7 April 1942

An item reported that an American submarine patrolling in the east China Sea torpedoed and sunk a 10,000 tons passenger-cargo ship and 1-5,000 tons cargo ship.

Source

Map Room Papers (Roosevelt Administration), 1942 - 1945. U.S. Joint Intelligence Committee. Daily summary No. 118 dated 7 April 1942