On 31 July 1944 Wimberley's rank of major-general was confirmed (with seniority backdated to 24 December 1943) and, in mid-December, Wimberley relinquished this appointment and, after handing over to Major-General Philip Gregson-Ellis, was appointed Director of Infantry at the War Office, his last appointment in the army, for which he was responsible for infantry training, although his assignment came at a difficult time, with the British Army then suffering from a severe manpower crisis, and the infantry having been forced to accept the worst recruits throughout the war. He held this post until his resignation from the army on 8 October 1946, after a 31-year military career, when it became clear that, with Montgomery having now become CIGS, in succession to Brooke, he would progress no higher in the army.