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First battles with Rommel

Rommel attempted to turn the left flank of the Eighth Army at the Battle of Alam el Halfa from 31 August 1942. The German/Italian armoured corps infantry attack was stopped in very heavy fighting. Rommel's forces had to withdraw urgently lest their retreat through the British minefields be cut off. Montgomery was criticised for not counter-attacking the retreating forces immediately, but he felt strongly that his methodical build-up of British forces was not yet ready. A hasty counter-attack risked ruining his strategy for an offensive on his own terms in late October, planning for which had begun soon after he took command. He was confirmed in the permanent rank of lieutenant-general in mid-October.

The conquest of Libya was essential for airfields to support Malta and to threaten the rear of Axis forces opposing Operation Torch. Montgomery prepared meticulously for the new offensive after convincing Churchill that the time was not being wasted. (Churchill sent a telegram to Alexander on 23 September 1942 which began, "We are in your hands and of course a victorious battle makes amends for much delay.") He was determined not to fight until he thought there had been sufficient preparation for a decisive victory, and put into action his beliefs with the gathering of resources, detailed planning, the training of troops—especially in clearing minefields and fighting at night —and in the use of 252 of the latest American-built Sherman tanks, 90 M7 Priest self-propelled howitzers, and making a personal visit to every unit involved in the offensive. By the time the offensive was ready in late October, Eighth Army had 231,000 men on its ration strength.