On 3 September 1939, shortly after the war started, the Bromberg Bloody Sunday incident occurred; the incident was used in Nazi propaganda and as an excuse for reprisals against the Polish population, following the occupation of the city by the Wehrmacht on 9 September.
On 3 September 1939, shortly after the war started, the Bromberg Bloody Sunday incident occurred in which a disputed number of German residents of Bromberg were killed in anti-German riots. The incident was exaggerated in Nazi propaganda as an excuse for reprisals against the Polish population following occupation of the city by German troops on 9 September.