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.
Battle of Olszynka Grochowska
The Polish forces deployed to the east of Warsaw constituted the majority of the Polish Army. Apart from the II Infantry Brigade under General Kazimierz Małachowski, dispatched to the north to take part in the Battle of Białołęka, the forces of General Józef Chłopicki included some 36000 soldiers and 115 cannon of various calibres. The majority of the Polish forces was composed of fresh, poorly trained and ill-equipped volunteers. However, the core of the Polish Army was composed of Napoleonic Wars veterans.