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 the Polish–Lithuanian Commonwealth (1764–1795)
Facing the Prussian and Russian armies approaching the capital, Kościuszko led the efforts to shore up the defenses and actively involve Warsaw's population. The siege of the city and attendant military skirmishes took place in July and August. From August 20, the insurrection reached the Prussian Partition, engulfing Greater Poland, up to parts of Pomerania and Silesia. Consequently, Frederick II of Prussia, ready to storm Warsaw, withdrew on September 6 toward the Bzura River and the Russians lifted the siege as well. Jan Henryk Dąbrowski led a corps dispatched to support the Greater Poland uprising and took Bydgoszcz, before having to return to the Bzura area, where a division commanded by Józef Poniatowski also fought the Prussians.