Battle of Warsaw (1920)
The battle of Warsaw was fought from August 12–25, 1920 as Red Army forces commanded by Mikhail Tukhachevsky approached the Polish capital of Warsaw and the nearby Modlin Fortress. On August 16, Polish forces commanded by Józef Piłsudski counterattacked from the south, disrupting the enemy's offensive, forcing the Russian forces into a disorganized withdrawal eastward and behind the Neman River. Estimated Russian losses were 10,000 killed, 500 missing, 30,000 wounded, and 66,000 taken prisoner, compared with Polish losses of some 4,500 killed, 10,000 missing, and 22,000 wounded.
History of Poland (1939–1945)
North of the Ukrainian Front, the 1st Belorussian Front under Marshal Georgy Zhukov went to the Oder along the Łódź and Poznań route. Still further north operated the 2nd Belorussian Front commanded by Marshal Konstantin Rokossovsky. The First Polish Army fought on the 1st and 2nd Belorussian Fronts. It entered the rubble of Warsaw on 17 January, formally liberating the city. Poznań was taken by Soviet formations after a bloody battle. In the context of the westbound offensive but also to support the clearing of East Prussia and the forces engaged in the Battle of Königsberg, the First Polish Army was directed northwards to the Pomeranian region, where its drive began at the end of January.