USS Mc Cook (DD-252) - As HMCS St. Croix

As HMCS St. Croix

Delayed by repairs necessitated by hurricane damage, on 14 March 1941 St. Croix assumed escort and patrol duties in Canadian waters. At the end of August she joined the Newfoundland Escort Force and plied between St. John’s, Newfoundland and Reykjavík. By May 1942 the force had been renamed the Mid-Ocean Escort Force and its range extended to Londonderry Port.

St. Croix sank U-90 on 24 July 1942, which, with other U-boats, had attacked her convoy (ON 113) on the 23rd, sinking two merchantmen and damaging a third. On the return voyage, Convoy ON 127 was attacked by 13 U-boats. Between 10 September and 14 September eleven merchantmen and one destroyer were lost.

En route from Londonderry Port to Gibraltar on 4 March 1943 with Convoy KMS 10, she assisted HMCS Shediac (K100) in the sinking of U-87 some 200 miles (370 km) off the Iberian coast.

With the addition of air escort to convoy defense in 1943, U-boat tolls in the North Atlantic diminished and many of the boats were withdrawn during the summer. In the fall, however, Germany began a new U-boat offensive. On 16 September, St. Croix, then on her first patrol with an offensive striking group in the Bay of Biscay, went to the aid of convoy ONS 18, followed by ON 202, both heavily beset by a wolfpack. The defense of these convoys resulted in a long-running battle with losses to both sides. The convoys lost three escorts and six merchantmen, with two escorts damaged. The wolfpack lost three U-boats.

St. Croix was the first escort to be sunk, taking three hits in the stern on the 20th. HMS Polyanthus (K47) was sunk as she came up to screen HMS Itchen's rescue operations. Itchen (K227), forced to retire that evening, returned the next morning and picked up 81 survivors from St. Croix and one from Polyanthus. The following day, 22 September, Itchen herself was torpedoed. Three men were rescued, two from Itchen, one from St. Croix.

An additional member of the St. Croix crew survived by virtue of not having been aboard. Chester Francis "Frank" Rudolph was involved in a bar fight just prior to St. Croix leaving on her fateful final mission, and was prevented from shipping out due to a badly cut up hand. Naval officials did not realize initially that Rudolph had not been aboard, as his family received three telegrams stating he had been lost at sea, then rescued, then lost again, all the while he was in a military hospital in Halifax, Nova Scotia.