Battle of the Bzura

Battle of the Bzura
	Part of Invasion of Poland, World War II
	; Polish cavalry brigade "Wielkopolska" during the battle
Date	9–19 September 1939
Location	Near Kutno, Łódź Voivodeship, Poland52°14′00″N 19°22′00″E / 52.23333°N 19.36667°E
Result	German victory Destruction of the Poznań and Pomeranian Armies;
Belligerents
Germany	Poland
Commanders and leaders
Gerd von Rundstedt ; Johannes Blaskowitz ; Walther von Reichenau ; Günther von Kluge ; Wilhelm Ulex ; Wilhelm Ritter von Leeb ; Erich Hoepner	Tadeusz Kutrzeba ; Władysław Bortnowski ; Edmund Knoll-Kownacki ; Mikołaj Bołtuć ; Roman Abraham ; Stanisław Grzmot-Skotnicki †; Franciszek Wład †; Leon Strzelecki
Strength
12 infantry divisions ; 5 armoured and motorized divisions ; 425,000 soldiers	8 infantry divisions ; 2–4 cavalry brigades ; 225,000 soldiers
Casualties and losses
8,000 dead ; 4,000 captured ; 50 tanks ; 100 cars ; 20 artillery pieces	18,000–20,000 dead; 32,000 wounded ; 170,000 captured

The Battle of the Bzura (or the Battle of Kutno) was the largest battle of the German invasion of Poland and was fought from 9 to 19 September 1939. It was a Polish counter-attack against the Germans.

The battle took place west of Warsaw, near the Bzura River. It began as a Polish counter-offensive and met some initial success, but it faltered as the Germans ultimately outflanked the Polish forces with a concentrated counter-attack, which significantly weakened the Polish forces and resulted in the destruction of the Poznań and Pomorze Armies. The conclusion of the battle marked the completion of the German occupation of Western Poland.