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.
Wola massacre
The majority of these atrocities were committed by troops under the command of "SS-Oberführer" Oskar Dirlewanger and "SS-Brigadeführer" Bronislav Kaminski. Research historian Martin Gilbert, from the University of Oxford, wrote: 
"More than fifteen thousand Polish civilians had been murdered by German troops in Warsaw. At 5:30 that evening [August 5], General Erich von dem Bach gave the order for the execution of women and children to stop. But the killing continued of all Polish men who were captured, without anyone bothering to find out whether they were insurrectionists or not. Nor did either the Cossacks or the criminals in the Kaminsky and Dirlewanger brigades pay any attention to von dem Bach Zelewski's order: by rape, murder, torture and fire, they made their way through the suburbs of Wola and Ochota, killing in three days of slaughter a further thirty thousand civilians, including hundreds of patients in each of the hospitals in their path."
On 5 August, the Zośka battalion of the Home Army had managed to liberate the Gęsiówka concentration camp and to take control of the strategically important surrounding area of the former Warsaw Ghetto with the aid of two captured Panther tanks belonging to a unit commanded by Wacław Micuta. Over the next few days of fighting this area became one of the main communication links between Wola and Warsaw's Old Town district, allowing insurrectionists and civilians alike to gradually withdraw from Wola ahead of the overwhelmingly superior German forces that had been deployed against them.