The Polish–Soviet War (14 February 1919 – 18 October 1920) was fought by the Second Polish Republic and the Soviet Russia over a region comparable to today's westernmost Ukraine and parts of modern Belarus. Following the Allied intervention in the Russian Civil War, Russia sought to relieve the pressure by crossing Poland in order to stimulate a Europe-wide communist revolution under the Trotskyist slogan "to give water to red horses out of the Wisła and Rhine" It ended with Soviet Russia losing large amounts of land in Ukraine and Belarus to Poland.
