Overlapping with and overshadowed by the First World War, the Allied Intervention in the Russian Civil War was one of the most ambitious military ventures of the twentieth century. Launched in the summer of 1918, it drew in 180,000 troops from fifteen different countries in theaters ranging from the Caspian Sea to the Arctic, and from Poland to the Pacific. Though little remembered today, its consequences stoked global political turmoil for decades to come. This book offers a sweeping and deeply researched account of the conflict.