If you want to know how the Commonwealth armies fought in the latter years of the Second World War, see the manuals issued by the British army published between 1946 and 1949 as they encapsulate wartime doctrine and technique.
With reference to Canada, in 1948-1949 the Canadian armoured corps produced an excellent tank troop leader's manual of basic and useful tactics, illustrated with cartoons, which more or less summed up everything learned painfully in 1943-1945. It included the really clever "corning drill" used by the Cdn army in Italy to get around a street corner in a built up area.
Unfortunately, the next time Cdn armour saw action, it was Korea and the manual did not cover the kind of fighting it experienced there.
Going back to the Napoleonic period, the 1813 Adye is probably the closest thing there is to a manual of RA tactics but I can reliablly date it to containing nothing later than 1811. If you want to know more about British gunners and their work in 1811-1815, you have to consult the postwar handbooks, of which Spearman is probably the best.