Even so, Churchill’s appointment as minister of munitions in July 1917 was made in the face of a storm of Tory protest. Excluded from the cabinet, Churchill’s role was almost entirely administrative, but his dynamic energies thrown behind the development and production of the tank (which he had initiated at the Admiralty) greatly speeded up the use of the weapon that broke through the deadlock on the Western Front. Paradoxically, it was not until the war was over that Churchill returned to a service department. In January 1919 he became secretary of war. As such he presided with surprising zeal over the cutting of military expenditure. The major preoccupation of his tenure in the War Office was, however, the Allied intervention in Russia . Churchill, passionately anti-Bolshevik, secured from a divided and loosely organized cabinet an intensification and prolongation of the British involvement beyond the wishes of any major group in Parliament or the nation—and in the face of the bitter hostility of labour. And in 1920, after the last British forces had been withdrawn, Churchill was instrumental in having arms sent to the Poles when they invaded the Ukraine.