In April 1938, the 7th Battalion, West Yorkshire Regiment converted to the armoured role as the 45th Battalion, Royal Tank Regiment. The Leeds Rifles was a long-standing Territorial Army infantry unit, founded by volunteers from the city ofLeeds in 1859. In June 1939, the company based at Morley was split off to form the cadre for a duplicate unit, the 51st Bn, Royal Tank Regiment.
The regiment took part in containing the German offensive of Operation Ochsenkopf in February - March 1943. At a place called Steamroller farm, two Churchill tanks ambushed and shot up an entire German transport column before rejoining the rest of their squadron. The end result was the destruction of two 88 mm, two 75 mm, two 50 mm and four smaller calibre anti-tank guns, twenty-five wheeled vehicles, two 3 inch Mortars, two Mark III tanks and nearly 200 Axis casualties. On 7–8 April, 51 RTR supported IX Corps at Fondouk Pass. The 128th Brigade of 46th Infantry Division crossed the Wadi Marguellil during the night and at 5.30 am on 8 April began its main attack, supported by 'C' Sqn 51 RTR, and by noon was on its objective. The regiment ended the campaign in Army reserve. The 25th Tank Brigade came under the command of BrigadierJames Noel Tetley of the Leeds Rifles at the end of the Tunisia campaign. He was the only Territorial Army officer of the Royal Tank Regiment to command a brigade on active service. The brigade, including 51 RTR, remained training in North Africa for almost a year, before they were required for service on the Italian Front. The regiment celebrated Cambrai Day in Algeria. 51 RTR embarked on 16 April 1944 and landed at Naples, where it was equipped with Churchill tanks, with a few Shermans and Stuarts.
Italy
The brigade distinguished itself in support of the 1st Canadian Infantry Division in the assault on the Hitler Line in May 1944. At the request of the Canadians, its regiments adopted the Maple leaf as an additional badge, later worn by 51 RTR's successors, the Leeds Detachment, Imphal Company, East and West Riding Regiment. Brigadier Tetley, formerly of the Leeds Rifles himself, was the only TA RTR officer to command a brigade on active service. 51 RTR went on to fight in the Gothic Line battles of August–September 1944. crews of HQ Troop, 51 RTR share out rations near their camouflaged vehicles before going into action in support of the 1st Canadian Division, Italy, 17 May 1944. To deal with the successive enemy lines of defences anticipated in the later stages of the campaign, it was decided in late 1944 to convert the brigade into the 25th Assault Engineer Brigade, equipped with the specialized tanks known as Hobart's Funnies. Organised on 5 January 1945, this was primarily a Royal Engineers formation, but 51 RTR remained in the brigade, although converted to specialised armour. 'B' Squadron received 15 Crab Mark II flail tanks, while 'A' and 'C' sqns had a total of 32 Churchill Crocodile flamethrowing tanks. Each squadron in the brigade was self-administering, so that they could be detached where required. 25 Armoured Assault Brigade first went into action at the crossing of the Senio on 9 April 1945. 51 RTR was attached to the 2nd New Zealand and 8th Indian Divisions. The flamethrowing tanks crept forward during the preliminary bombardment and positioned themselves close to the floodbank as possible. One minute before the infantry assault started, the positions were flamed. Most of the Crocodiles had to be 60 feet behind the bank to be able to direct their flame over the bank. World War II in Europe ended shortly after this operation.
Postwar
When the Territorial Army was reformed after the war, it included a combined 45th/51st RTR. The personnel received their tank training from 'A' Sqn of 6 RTR at RAF Worksop. Brigadier Noel Tetley was the honorary colonel. In 1956, the 45th/51st RTR returned to the infantry role under its old title of 7th Bn West Yorkshire Regiment. It carried the honorary distinction on its colours and appointments of the badge of the Royal Tank Regiment with the dates '1942-45' and two scrolls inscribed 'North Africa' and 'Italy'.