Battle of the Bzura

The Battle of the Bzura was both the largest battle and Polish counter-attack of the German invasion of Poland and was fought from 9 to 19 September. The battle took place west of Warsaw, near the Bzura River. It began as a Polish counter-offensive, which gained initial success, but the Germans outflanked the Polish forces with a concentrated counter-attack. That weakened Polish forces and the Poznań and Pomorze Armies were destroyed. Western Poland was now under German occupation.: 65–70  The battle has been described as "the bloodiest and most bitter battle of the entire Polish campaign". Winston Churchill called the battle an "ever-glorious struggle".