Rommel attempted to turn the left side of the Eighth Army at the Battle of Alam Halfa from 31 August 1942. The German/Italian armoured Corps infantry attack was stopped in very heavy fighting. Rommel's forces had to withdraw quickly so that they could escape though the British minefields be cut off. Montgomery was criticised for not counter-attacking the retreating forces immediately, but he felt strongly that his 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.