The Russian Civil War took place between 1918 and 1923 (though most combat ended by 1920), and seems as if it could be possible to make a mod based on it for Empires. There would be 7 factions: Red Army (Bolshevik), White Tsarist Army (in Siberia), White Republican Army (in Russia proper, Ukraine, and Caucasus), Green Army (Ukrainian peasants), Black Army (Ukrainian anarchists), the Allies, and the Poles. It would be interesting to try to change history in this war. I wonder how someone could mod an anarchist faction to fund its efforts, as well as incorporate allied support for the White Armies.