The Massacre in Zakroczym, Poland, took place on 28 September 1939 when, in spite of a cease-fire, soldiers of Panzerdivision Kempf stormed Polish positions at Zakroczym, where soldiers from the 2nd Infantry Division were getting ready to surrender.
German troops broke into houses, robbed them, set them on fire, and tossed hand grenades into the basements filled with scared civilians.
Kazimierz Szczerbatko estimated, based on the testimony of the eyewitnesses, that the Germans killed around 500 soldiers and 100 civilians.
The massacre may have been revenge for the Battle of Mława, in which the Germans suffered 1,800 killed, 3,000 wounded and 1,000 missing.
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