[ger. Bromberger Blutsonntag] incidents in Bydgoszcz on 3-5 September 1939, in which around 300 to 422 German inhabitants were killed in fight or executed, according to Polish version in a revenge for sabotage attacks against Polish troops behind the front line. The term used by Nazi propaganda, which claimed that the number of casualties was 58.000. The details of the incident are disputed among historians.