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 Lenino
After the victory of the Czechoslovak troops at the Battle of Sokolovo, this was the second time that a foreign force trained by the Soviet Union participated in the Soviet-German front. In comparison, the circumstance of the Polish force was quite different from their Czechoslovak comrades. In mid-1941, the Soviet Union also agreed to help form Anders' Army, a Polish force formed under general Władysław Anders from the Polish citizens taken captive by the Soviets in 1939-1941 and released after the Soviets were attacked by their former German allies. However, due to differences in opinions and due to the reluctance of Anders to put his malnourished, untrained and unequipped troops into battle, these Polish forces did not take part in the fight on Soviet territory. Finally, in early 1942, Anders' troops were evacuated to Iran, becoming the Polish Armed Forces in the West to fight alongside the British forces in Europe. Many of those freed prisoners who were unable to join Anders in the evacuation, joined the Polish force formed under general Zygmunt Berling, who had defected from Anders' Army. These became the Polish First Army and Polish Second Army under Soviet command. This Polish force, sometimes called "Berling's Army", played an important role in the fight against Nazi Germany and the capture of Berlin.