Bloody Sunday (; ) was a sequence of violent events that took place in Bydgoszcz (), a Polish city with a sizable German minority, between 3 and 4 September 1939, during the German invasion of Poland.
Standing in the path of the German army's advance during the early days of the invasion, tensions quickly escalated in Bydgoszcz between the city's sizable German-speaking minority and its Polish majority. On 3 September, as the Wehrmacht was preparing to assault the city, members of the German minority working in conjunction with the German intelligence agency (Abwehr) attacked the Polish garrison. Polish soldiers and civilians reacted with violent reprisals against ethnic Germans, who in turn reacted with more violence. A Polish investigation concluded in 2004 that approximately 40–50 Poles and between 100 and 300 Germans were killed.
The term "Bloody Sunday" was applied to the events by Nazi propaganda officials, who highlighted and exaggerated German casualties. An instruction issued to the press said, "... must show news on the barbarism of Poles against Germans in Bromberg. The expression 'Bloody Sunday' must enter as a permanent term in the dictionary and circumnavigate the globe. For that reason, this term must be continuously underlined."
Approximately 200–400 Polish hostages were shot in a mass execution in the aftermath of the fall of the city on 5 September. Additionally, fifty Polish prisoners of war from Bydgoszcz were accused by Nazi summary courts of taking part in "Bloody Sunday" and shot. The reprisals compounded violence stemming from the German attempts to pacify the city, and the premeditated murder of notable Poles as part of Operation Tannenberg. As part of the latter, the Germans murdered 1,200–3,000 Polish civilians in Bydgoszcz, in a part of the city that became known as the Valley of Death.
Background Bydgoszcz (Bromberg) was part of the Polish–Lithuanian Commonwealth until 1772, when it was annexed by the Kingdom of Prussia during the First Partition of Poland. As a part of Prussia, the city was affected by the unification of Germany in 1871 and became part of the German Empire. It would remain a part of the German Empire until the end of World War I. In February 1920, the Treaty of Versailles awarded the city and the surrounding region to the Second Polish Republic (the administrative region of Pomeranian Voivodeship). This resulted in a number of ethnic Germans leaving the region for Germany. Over the interwar period, the German population decreased even further.
The emergence of the Nazi Party in Germany had an important impact on the city. Adolf Hitler revitalized the Völkisch movement, making an appeal to the German minority living outside of Germany's post-World War I borders and recruiting its members for Nazi intelligence. It was Hitler's explicit goal to create a Greater German State by annexing territories of other countries inhabited by German minorities. By March 1939, these ambitions, charges of atrocities on both sides of the German-Polish border, distrust, and rising nationalist sentiment in Nazi Germany led to the complete deterioration of Polish-German relations. Hitler's demands for the Polish inhabited Polish Corridor and Polish resistance to Nazi annexation fueled ethnic tensions. For months prior to the 1939 German invasion of Poland, German newspapers and politicians like Adolf Hitler had carried out a national and international propaganda campaign accusing Polish authorities of organizing or tolerating violent ethnic cleansing of ethnic Germans living in Poland.
After Germany invaded Poland on 1 September 1939, ethnic Germans living in Poland were in many places subjected to attacks, and the Polish government arrested ten to fifteen thousand on suspicion of being loyal to Germany, marching them toward the east of the country. Eventually, around 2000 ethnic Germans died in such actions. Nazi propagandists used these incidents to claim that the invasion was justified, and the events in Bydgoszcz became emblematic of this.Kershaw 2001, p. 242
The incident Beginning with the Nazi invasion of Poland on 1 September, fighting broke out in Bydgoszcz between Polish troops and ethnic Germans in the city, many of whom were later revealed to belong to clandestine groups organized by the Nazi party. As the Wehrmacht's Fourth Army prepared to storm the city of Bydgoszcz on 3 September, the violence intensified, resulting in the deaths of up to 300 ethnic Germans and 40 to 50 Poles. Sources differ on the circumstances of the killings, but it is apparent that at least some were killed in an anti-German pogrom.
The killings were incited by fifth column attacks by ethnic German partisans against the Polish garrison. According to historian Jochen Böhler, recently unearthed German documents confirm that the violence was sparked when Polish soldiers were attacked by agents of the Nazi intelligence organization Abwehr recruited from among the city's German minority.
Beginning in early September, the Abwehr reported in documents prepared by general Erwin von Lahousen that German armed saboteurs conducting operations behind the front line in Bydgoszcz suffered heavy losses."Niemiecka dywersja w Polsce w 1939 r. w świetle dokumentów policyjnych i wojskowych II Rzeczpospolitej oraz służb specjalnych III Rzeszy" Tomasz Chińciński, page 181 Pamięć i Sprawiedliwość 4/2 (8), 159-195. 2005 Their operations coordinated by Abwehr residents in Bydgoszcz-Grischner are documented in operational reports and plans in Abwehr archives. Among the tasks allocated to armed saboteur groups documented in German archives were: blowing up the main office of the German organization Deutsche Vereinigung, the passport office Deutsche Paßstelle, the German private school, and setting fire to the German theater and offices of the Jungdeutsche Partei. These operations are documented as coordinated and organized by Schutzstaffel SS. Additionally a special Abwehr sabotage group was located in Bydgoszcz according to German records from Abwehr Breslau department, called Sabotage-Organisationen Gruppe 12 whose task was to disable a local power-plant and cut phone communications between Inowrocław and Toruń."Niemiecka dywersja w Polsce w 1939 r. w świetle dokumentów policyjnych i wojskowych II Rzeczpospolitej oraz służb specjalnych III Rzeszy" Tomasz Chińciński, page 180 Pamięć i Sprawiedliwość 4/2 (8), 159-195. 2005
Besides these sabotage groups in Bydgoszcz, the Abwehr also recorded in its documents paramilitary groups that were formed in the city. According to German records stored in Bundesarchiv-Militärarchiv in Freiburg they counted 150 members in Kampf-Organisation under leadership of a local German named Kleiss and were part of a larger military formation coordinated from Poznan which altogether had 2,077 members. In addition to this group a 10-member combat unit under command of a German named Otto Meister was also formed in Bydgoszcz and received orders from Wrocław local office of Abwehr. By the end of August just before the invasion took place Polish police conducted several arrests during which they found explosives, armbands and guns.Der "Volksdeutsche Selbstschutz" in Polen 1939/1940 Christian Jansen, Arno Weckbecker page 26-27, page 2010
During the night between 2 and 3 September a number of German saboteurs dressed up in Polish uniforms woke up inhabitants of two districts in Bydgoszcz telling them to run as Poland has been defeated, and as a result a significant number of civilians panicked and started fleeing the city. The chaotic flight disrupted and restricted movements of the Polish military on the roads.Historia Bydgoszczy, Tom II, część druga 1939-1945, pod redakcją naukową Mariana Biskupa, Bydgoszcz 2004 Wydarzenia 3 i 4 września 1939 r. w Bydgoszczy - "Blutsonntag"
By the morning of 3 September a certain few Germans who were in good relationship with their Polish neighbors started warning them to hide as "something bad will happen in the city", offering them shelter under the condition that they must hide by 10 AM, but stated they could not disclose details on what would take place.
As a contingent of the Polish Army (Army Pomorze's 9th, 15th, and 27th Infantry Division) was withdrawing through Bydgoszcz it was attacked by German irregulars from within the city. According to a British witness, a retreating Polish artillery unit was shot at by Germans from within a house; the Poles returned fire and were subsequently shot at from a Jesuit church. In the ensuing fight both sides suffered some casualties; captured German nonuniformed armed insurgents were executed on the spot and some mob lynching was also reported. A Polish investigation concluded in 2004 that Polish troops had been shot at by members of the German minority and German military intelligence (Abwehr) agents; around 40–50 Poles and between 100 and 300 Germans were killed.
The German forces which entered the city also encountered resistance from members of the paramilitary Citizen Watch (Straż Obywatelska), particularly in the Szwederowo neighborhood, which was predominantly inhabited by working-class individuals. The Citizen Watch in Bydgoszcz relinquished its weapons after receiving assurances from General Eccard von Gablenz, commander of the Kampgruppe "Netze", that its members would be treated in accordance with international law as POWs.
German propaganda Goebbels' Propaganda Ministry heavily exploited the events to try to gain support in Germany for the invasion. As British historian Ian Kershaw wrote:
Hitler's secret decree of 4 October 1939 stated that all crimes committed by the Germans between 1 September 1939 and 4 October 1939 were not to be prosecuted.Diemut Majer, Non-Germans Under The Third Reich, p.424
The Wehrmacht War Crimes Bureau investigation in 1939–1940 claimed that the events were a result of panic and confusion among the Polish troops. The Wehrmacht investigation included the interrogation of captive Polish soldiers, ethnic Germans from Bydgoszcz and surrounding villages, and Polish civilians. The bodies of the victims were exhumed and the cause of death and the possible involvement of military rifles was assessed.
German reprisals and atrocities
The events were followed by German reprisals and mass executions of Polish civilians. In an act of retaliation for Bloody Sunday, a number of Polish civilians were executed by German military units of the Einsatzgruppen, Waffen SS, and Wehrmacht. According to German historian Christian Raitz von Frentz, 876 Poles were tried by German tribunal for involvement in the events of Bloody Sunday before the end of 1939. 87 men and 13 women were sentenced without the right to appeal. Polish historian Czesław Madajczyk notes 120 executions in relation to Bloody Sunday, and the execution of 20 hostages after a German soldier was allegedly attacked by a Polish sniper.
The assurances issued to the Citizen Watch which surrendered after being promised that they were to be treated in accordance with international law as POWs were not upheld by the Germans. The captured Citizen Watch members were handed over by the Wehrmacht to members of Einsatzgruppe IV. Approximately 40 prisoners were subjected to fatal beatings by SS men using metal rods. The remaining POWs, which included the leaders of the Citizen Watch, Konrad Fiedler and Marian Maczuga, were executed by gunfire in the Bielawki neighborhood of Bydgoszcz.
Additionally, in the Boryszew massacre fifty Polish prisoners of war from Bydgoszcz were accused by Nazi summary courts for taking part in "Bloody Sunday" and shot.