Royal Canadian Navy service

HMCS Warrior passing under the Lions' Gate Bridge, ca. 1946–1947

As the focus of future operations at sea during the Second World War shifted to the Pacific theatre, planning began in May 1944 that the Royal Canadian Navy (RCN) would require a larger fleet both in numbers and in size of ships. In the effort to get bigger, the RCN returned the escort carriers then on loan, Puncher and Nabob, in exchange for the loan of two light fleet carriers. A formal approach was first made in July, with negotiations being finalised in April 1945 when Warrior and Magnificent were acquired on loan with the option to purchase them outright at a later date. Negotiations were completed in May for the naval air squadrons that would be needed to man the aircraft carrier, however the war ended before the ships were completed.^[12][13]

After the agreement with Canada went through, Canadian naval aviation was established with the formation of four squadrons transferred from the Fleet Air Arm intended to fly from Warrior; 803 Squadron and 883 Squadron equipped with Supermarine Seafires and 825 Squadron and 826 Squadron with Fairey Fireflys.^[14] Warrior was completed, transferred to the RCN and commissioned as HMCS Warrior on 24 January 1946 and placed under the command of Captain Frank Houghton.^[15] Sea trials were completed in March and flying trials were performed at Spithead following that. For the voyage to Canada, 803 and 825 Squadrons were embarked, while 883 and 826 Squadrons were paid off.^[16]

Warrior entered Halifax harbour on 31 March 1946, a week after leaving Portsmouth. She was escorted by the destroyer HMCS Micmac and the minesweeper HMCS Middlesex, having officially joined the Canadian Atlantic Fleet on 23 March.^[11][15] April through May was spent alongside fixing builder's defects before the ship began major fleet operations. In August, the aircraft carrier had its first loss, when a Firefly from 825 Squadron ditched, though both the pilot and observer were recovered. That same month, on 23 August while transiting the St. Lawrence River, Warrior ran aground at Pointe Sainte Antoine, near Montreal while en route to the city after her rudder jammed. Tugboats got the aircraft carrier unstuck from the mud bank she had run into the same day and Warrior continued on to Montreal where she became the largest ship to visit that port to that date.^[17]

HMCS Warrior in Vancouver, British Columbia

The RCN experienced problems with the unheated equipment during operations in cold North Atlantic waters off eastern Canada during 1946. The ship was transferred west to Esquimalt, British Columbia in November 1946, visiting Bermuda, Acapulco, Mexico and San Diego, California before arriving in December. On 18 January 1947, Commodore Harry DeWolf took command of Warrior while the vessel was undergoing repairs to the damages to her hull that had been received during her August grounding. On 31 January, one 825 Squadron's Fireflys was lost along with its pilot off Portland Island during a training mission. It was during this period, that the RCN, facing reduced defence spending and manning constraints, came to the conclusion that they could not operate two aircraft carriers. Negotiations began to return Warrior when Magnificent became ready, with the RCN deeming Warrior unfit for service due to her lack of heating. In February 1947, the aircraft carrier began her voyage back to Halifax, accompanied by the cruiser Uganda and destroyer Crescent. The Canadian group stopped at San Pedro, California before the aircraft carrier transited the Panama Canal by herself, meeting the destroyers Nootka and Micmac on the other side. The three Canadian ships visited Havana, Cuba, marking the first time a Canadian warship had visited the Cuban capital since 1929. Warrior returned to Halifax on 27 March. The ship then sailed for Bermuda with Nootka to take part in a naval exercise with the Royal Navy. Most of mid-1947 was spent undergoing repairs at Halifax and performing short cruises along east coast. In August, Warrior sailed for the United Kingdom where her squadrons would be re-equipped with Firefly Mark IV and Hawker Sea Fury aircraft, returning to Halifax on 28 August. Meanwhile, preparations were being made for the return of Warrior and the acquisition of Magnificent. In November, Magnificent's air group consisting of 826 and 883 Squadrons trained aboard Warrior off the coast of Nova Scotia. Following this, Warrior, escorted by the destroyer Haida sailed to Bermuda where the ship was prepared to be paid off. The ship sailed for the UK on 12 February, arriving at Belfast on 20 February. On 1 March the ship moved to Spithead where the aviation fuel was removed.^[18] Warrior was returned to the Royal Navy on 23 March 1948 at Portsmouth.^[11]

Royal Navy service

HMCS Warrior returned to the United Kingdom and was recommissioned as HMS Warrior on 23 March 1948. Warrior was then refitted at Devonport and equipped with a flexible flight deck to test the feasibility of receiving undercarriage-less aircraft; modified de Havilland Sea Vampire aircraft were used to test the concept, which was successful but not introduced into service. The flexible deck was composed of a rubber sheet supported by air bags. The new deck extended from the bow to the barrier forward of the island and was superimposed on the existing flight deck.^[2] Aft of the flexible deck, a light steel ramp was placed over the flight deck rising to 2 feet 6 inches (0.8 m) in height with a single arrestor wire.^[9] The trials lasted from November 1948 to March 1949 and upon completion, Warrior was paid off into the reserve at Portsmouth.^[11]

HMS Warrior, USS Des Moines, and HMS Gambia at Grand Harbour, Malta, 1951

Warrior was reactivated in June 1950 and modified to carry troops and aircraft to the Far East during the Korean War, departing in August on the first such mission. In June 1951, with 16 Parachute Brigade embarked, Warrior sailed to Cyprus in response to a crisis in the Middle East.^[11] The ship underwent refit during most of 1952 and 1953 at Devonport Dockyard. The ship was fitted with a new lattice mast and new radars with Type 281Q fitted to the mast and Type 277Q radars installed fore and aft of the island. Identification friend or foe aerials were also installed on the mast. The bridge was enlarged and enclosed. The Fleet Air Arm 811 Squadron in Sea Furys and 825 Squadron in Fireflys were embarked after sea trials. During 1954, Warrior was deployed to the Far East, patrolling off the coast of Korea, following the ceasefire. In September, during Operation Passage to Freedom, the ship was among those sent to evacuate non-Communist refugees from Haiphong, North Vietnam to Vung Tau, South Vietnam, transporting more than 3,221 people in two voyages and being awarded a South Vietnamese Presidential Citation.^[19][20]

After returning to England another refit was carried out in 1955 at Devonport. This time Warrior received an angled flight deck of 5 degrees for trials.^[21] To install the angled deck, portside sponsons were removed, the angled deck installed portside amidships and the deck itself was upgraded to take aircraft up to 20,000 pounds (9,072 kg). Furthermore, the catapult was upgraded to launch 20,000-pound aircraft and the arrester wire system improved to take the same weight of aircraft at 60 knots (111 km/h). The aircraft carrier also received a mirror landing aid and Type 961 CCA radar. As the only ship in the class to receive the upgrade, it was intended to turn Warrior into a training and trials ship.^[22]

Following a short period as a training ship, Warrior was dispatched to the Pacific Ocean, where the aircraft carrier took part in Operation Grapple, the first British hydrogen bomb tests, as the headquarters ship embarking a flight of Westland Whirlwind helicopters and Grumman Avenger AS4 aircraft to collect air samples from the tests and ferry them back for examination.^[22] After the operation was completed the Avengers were catapulted into the sea as they were contaminated with radioactivity. Considered surplus to requirements by the late 1950s, the Royal Navy decommissioned Warrior in February 1958 and offered her for sale. The return voyage from the Grapple tests was via Argentina, with port visits and demonstrations to the Argentine Navy, to whom the Admiralty was trying to sell her.^[22]

Argentine Navy service

ARA Independencia in 1965

The badge of ARA Independencia

Warrior was sold to Argentina in 1958 and renamed ARA Independencia on 6 August 1958. The Argentine naval ensign was raised on 4 November at Portsmouth and sailed for Argentina on 10 December.^[21][22] The Argentine Naval Aviation began air operations from Independencia on 8 June 1959, even before the vessel was officially commissioned into the fleet. The ship was commissioned into the Argentine Navy on 8 July 1959.^{[21][lower-alpha 1]} The anti-aircraft armament was initially reduced to twelve 40 mm guns, soon further reduced to eight. In May 1962 the ship was however provided with one quadruple and nine double mountings of that caliber. After all the modifications the displacement of the ship had climbed to 19,600 long tons (19,900 t) while the vessel's maximum speed had declined to 23 knots (43 km/h; 26 mph).^[21]

The air group, which had a maximum of 24 aircraft, was mainly formed from Vought F4U Corsairs, North American SNJ-5Cs Texans and Grumman S2F-1 (S-2A) Trackers. Naval Aviation inventory also included Grumman F9F Panther (the first jet fighters in service with the Argentine Naval Aviation, starting from August 1963 which launched from Independencia) and TF-9J Cougar jets, although Independencia's catapult was not powerful enough to launch them.^[23] The ship also used the North American T-28 Trojan trainer.^[21] The aircraft carrier ARA Veinticinco de Mayo, also of the British Colossus class but with a more powerful catapult retrofitted while in Dutch service, entered service in 1969, and Independencia moved to the reserve in 1970. She was scrapped in 1971.^[22]