Mechanization signaled the end of the cavalry but the renaissance of heavy cavalry doctrine. The tank heralded the return of breakthrough operations and maneuver warfare. Initially, the western cavalries refused doctrinal revision and chose instead to fight bitter rear guard actions against Fullerist zealots. / The Canadian Cavalry, prompted by Blitzkrieg's triumphs, effortlessly evolved into a tank force---virtually overnight. Canadian doctrine, however, was ersatz. Denied its own vast training areas, the RCAC was sandwiched into southern England and saddled with British warfighting techniques developed in the Western Desert. In Normandy, Canadian operational art was driven by Generals Simonds and Crerar, both gunners, who had neither the skill nor experience to conduct armoured warfare. Hampered by General Montgomery's inability to reproduce a strategic offensive comparable to that demonstrated on the Russian front, Allied armoured forces were squandered in mismanaged frontal attacks. / In the United States, the attempts to protect the horse forced a praetorian's revolt that ended with General Chaffee garroting the US Cavalry, eliminating it from future battlefields. The doctrinal dominance of the American Armored Force was subsequently threatened by a cabal under artillery General Leslie McNair who imposed the Tank Destroyer philosophy. Internecine squabbles and economic nationalism prevented America from producing a tank capable of meeting German panzers on even terms. Though failing technically, the US Armored force succeeded doctrinally via the Louisiana maneuvers and produced a balanced Armored Division. General Bradley's 12th Army Group arrived in France with a purposeful dogma that had been further refined at the Combat Command, Divisional, and Corps level in North Africa and Sicily. / American armour maneuvered during Operation Cobra but it did not fight massed panzers; this was soon redressed in Lorraine where American armoured doctrine reached tactical maturity. Canadian armour fought tank battles throughout Operations Spring, Totalize and Tractable, but it did not maneuver. American and Canadian armour's best opportunity for strategic victory occurred in Normandy. The Canadians, despite better tanks and favourable terrain, failed operationally and received no second chance.

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