Not a few Orthodox priests joined directly in the massive effort of the Red Army in the ‘civil’ war (the White armies were funded and supported with troops and equipment by the Entente) after the October Revolution:
The Second Army had a rather peculiar agitator: he had been a priest before the October Revolution, but after he had become an agitator for the Bolsheviks. At a meeting of five thousand Red Army men in Perm he spoke of the Soviet power’s intimate link with the masses. “The Bolsheviks,” he said, “are today’s apostles.” When asked by a Red Army man in the audience, “What about baptism?” he answered: “That would take a couple of hours to explain, but briefly it’s pure eyewash”.
Krupskaya, Reminiscences of Lenin, p. 526.