Battle of Kampinos Forest

By 16 September, the remnants of the Polish Wielkopolska Cavalry Brigade, the Podolska Cavalry Brigade, and the 15th and 25th Infantry Divisions, broke out of the Bzura Pocket into the Kampinos Forest. They were withdrawing through the large forest complex towards Warsaw and the Modlin Fortress.

The route was adopted by the Pomorze Army, under Gen. Władysław Bortnowski, the Poznań Army, under Gen. Tadeusz Kutrzeba. At the same time the German Wehrmacht tried to cut the Polish forces out by assaulting the forests both from the north and from the south.