The Boryszew massacre, which took place on September 22, 1939, in the village of Boryszew (now a district of Sochaczew), was a war crime committed by the Wehrmacht during its invasion of Poland. On that day, 50 Polish prisoners of war from the "Bydgoszcz" Battalion of National Defense were executed following a kangaroo court trial. The massacre was carried out in retaliation for the battalion’s participation in the events of the so-called "Bloody Sunday" in Bydgoszcz.
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