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Casualty conservation policy

The British high command were not only concerned with winning the war and defeating Germany, but also with ensuring that it retained sufficient influence in the post-war world to govern global policy. Suffering heavy losses in Normandy would diminish British leadership and prestige within its empire and on post-war Europe in particular. Many of Montgomery's clashes with Eisenhower were based on his determination to pursue the war "on lines most suitable to Britain".

The fewer the number of combat-experienced divisions the British had left at the end of the war, the smaller Britain's influence in Europe was likely to be, compared to the emerging superpowers of the United States and the Soviet Union. Montgomery was thus caught in a dilemma—the British Army needed to be seen to be pulling at least half the weight in the liberation of Europe, but without incurring the heavy casualties that such a role would inevitably produce. 21st Army Group scarcely possessed sufficient forces to achieve such a military prominence, and the remaining divisions had to be expended sparingly.

In 1944, Britain did not possess the manpower to rebuild shattered divisions and it was imperative for Montgomery to protect the viability of the British army. It was reported to the War Office that "Montgomery has to be very careful of what he does on his eastern flank because on that flank is the only British Army there is left in this part of the world". The context of British casualties and the shortage of reinforcements, prompted Montgomery to "excessive caution". Dempsey wrote on 13 June, that Caen could only be taken by a "set piece assault and we did not have the men or the ammunition for that at the time".

Montgomery's solution to the dilemma was to attempt to remain Commander of All Land Forces until the end of the war, so that any victory attained on the Western front—although achieved primarily by American formations—would accrue in part to him and thus to Britain. He would also be able to ensure that British units were spared some of the high-attrition actions, but would be most prominent when the final blows were struck. When that strategy failed, he persuaded Eisenhower to occasionally put some American formations under the control of the 21st Army Group, so as to bolster his resources while still maintaining the outward appearance of successful British effort.

Montgomery initially remained prepared to push Second (British) Army hard to capture the vital strategic town of Caen, and consequently incur heavy losses. In the original Overlord plan, Montgomery was determined to push past Caen to Falaise as quickly as possible. However, after the heavy casualties incurred in capturing Caen, he changed his mind.