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 Łomianki
After the defeat of two Polish Armies in the Battle of Bzura, except for a few units, all Polish divisions and brigades were cut off in the Western Poland. They had no choice, but to withdraw to Modlin Fortress or Warsaw. A couple divisions and brigades did successfully reach Warsaw, but majority was halted by the Germans who were about to close the ring around the Polish capital. Around 5,000 Polish soldiers and officers lead by General Mikołaj Bołtuć decided to fight by Łomianki.