This study discusses the Russo-Polish campaign of 1920. Topics include the enemy situation on the Vistula in 1920 (character and aims of Tuchaczewski), influence of the terrain on the decision of Tuchaczewski in 1920, disposition of the Russian armies below Warsaw, analysis of the Russian dispositions, attack of the 5th Army, principles of the decision of the commander of the Fifth Army, attack order, morale preparation of the Battle of the Wkra, offensive of the Fifth Army, and combats of the 1st Army at Radzymin, among others.