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 achieved 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.
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