At 21.35 hours on 21 Feb 1943, U-664 fired torpedoes at convoy ONS-167 about 550 miles west of Fastnet, Ireland and reported three hits on a steamer and one on a tanker. The ships hit were Rosario in station #11 and H.H. Rogers in station #13.

The H.H. Rogers (Master Clinton W. Hayes) was struck by one torpedo on the port side around #10 main tank rupturing the tank, the decks in the vicinity and the fireroom bulkhead. This resulted in the engine and fire rooms flooding. After 30 minutes, the officers decided that the ship could not be saved and the order to abandon ship was given. All 47 American crew members and 26 armed guards abandoned ship in three lifeboats (one lifeboat had been destroyed in the explosion) and all rafts. One of the lifeboats picked up several survivors from the Rosario, which had been in the water for about one hour.
Almost all survivors were picked up by the British rescue ship Rathlin and landed at Halifax on 6 March. Four men on a raft were picked up by a British corvette and landed at St.Johns on 1 March. The wreck of the tanker was later sunk by U-664 with a coup de grâce in 50°13N/24°48W.