History
United States
Name	unnamed (DE-517)
Builder	Boston Navy Yard, Boston, Massachusetts
Laid down	9 July 1943
Launched	13 August 1943
Completed	9 November 1943
Commissioned	never
Fate	Transferred to United Kingdom 9 November 1943
Acquired	Returned by United Kingdom 20 March 1946
Fate	Sold 17 June 1946
United Kingdom
Name	HMS Louis (K515)
Namesake	Rear Admiral Sir Thomas Louis (1758-1807), British naval officer who was commanding officer of HMS Minotaur at the Battle of the Nile in 1798[2]
Acquired	9 November 1943
Commissioned	9 November 1943[1]
Fate	Returned to United States 20 March 1946
General characteristics
Displacement	1,140 long tons (1,158 t)
Length	289.5 ft (88.2 m)
Beam	35 ft (11 m)
Draught	9 ft (2.7 m)
Propulsion	Four General Motors 278A 16-cylinder engines GE 7,040 bhp (5,250 kW) generators (4,800 kW) GE electric motors for 6,000 shp (4,500 kW) Two shafts
Speed	20 knots (37 km/h)
Range	5,000 nautical miles (9,260 km) at 15 knots (28 km/h)
Complement	156
Sensors and processing systems	SA & SL type radars Type 144 series Asdic MF Direction Finding antenna HF Direction Finding Type FH 4 antenna
Armament	3 × 3 in (76 mm) /50 Mk.22 guns 1 × twin Bofors 40 mm mount Mk.I 7–16 × 20 mm Oerlikon guns Mark 10 Hedgehog antisubmarine mortar Depth charges QF 2-pounder naval gun
Notes	Pennant number K515

The second HMS Louis (K515) was a British Captain-class frigate of the Royal Navy in commission during World War II. Originally constructed as the United States Navy Evarts-class destroyer escort DE-517, she served in the Royal Navy from 1943 to 1946.

Construction and transfer

The ship was laid down by the Boston Navy Yard in Boston, Massachusetts, on 9 July 1943 as the unnamed U.S. Navy destroyer escort DE-517 and launched on 13 August 1943. The United States transferred the ship to the United Kingdom under Lend-Lease on 9 November 1943.

Service history

The ship was commissioned into service in the Royal Navy as HMS Louis (K515) on 9 November 1943^[1] simultaneously with her transfer. She served on antisubmarine patrol and convoy escort duty in the Bay of Biscay, North Atlantic Ocean, and Arctic Ocean. On 24 August 1944, she sank the German submarine U-445 with depth charges in the Bay of Biscay west of St. Nazaire, France, at position 47°21′00″N 005°50′00″W / 47.35000°N 5.83333°W / 47.35000; -5.83333 (U-445 sunk).^[1]

The Royal Navy returned Louis to the U.S. Navy at the Philadelphia Naval Shipyard in Philadelphia, Pennsylvania, on 20 March 1946.

Disposal

The United States Government sold Louis to the Commonwealth of Pennsylvania on 17 June 1946.