On the night of 9 September, the Polish Poznań Army commenced a counterattack from the south of the Bzura river, its target being the German forces from the 8th Army advancing between Łęczyca and Łowicz, towards Stryków. The commander of Poznań Army, Tadeusz Kutrzeba noticed that the German 8th Army, commanded by general Johannes Blaskowitz, was weakly secured from the north by only the 30th Infantry Division stretched over a 30 kilometre defensive line while the rest of the army was advancing towards Warsaw. The main thrust of the Polish offensive were the units under general Edmund Knoll-Kownacki, known as the Knoll-Kownacki Operational Group (Polish 14th, 17th, 25th and 26th Infantry Divisions). The right wing of the offensive, in the area Łęczyce, included the Podolska Cavalry Brigade under Col. L. Strzelecki, and on the left, advancing from Łowicz to the area of Głowno, the Wielkopolska Cavalry Brigade under general Roman Abraham. These groups inflicted considerable losses on the German defenders from the 30th Infantry Division and the 24th Infantry Division, with some 1,500 German soldiers killed or wounded and an additional 3,000 lost as prisoners during the initial push. The cavalry brigades supplemented with TKS and TK-3 reconnaissance tanks moved to threaten the flanks and rear of the advancing German units.