In the later stages of the European war, particularly after their success at Vimy Ridge and Passchendaele, the Canadian Corps was regarded by friend and foe alike as one of the most effective Allied military formations on the Western Front. In August 1918, the CEF's Canadian Siberian Expeditionary Force travelled to revolution-torn Russia. It reinforced a garrison resisting Lenin's Bolshevik forces in Vladivostok during the winter of 1918–19. At this time, another force of Canadian soldiers were placed in Archangel, where they fought against Bolsheviks.