by the evening of 1 september 1939, xix army corps had with its 3rd panzer division advanced through the city of pruszcz and captured a bridgehead east of the river brda. 20th infantry division, commanded by mauritz von wiktorin, was involved in two notable battles on that day: at the charge at krojanty, the polish 18th pomeranian uhlans charged units of the 76th infantry regiment on horseback and were then dispersed by german armored cars, birthing the nazi propaganda myth of polish cavalry charging german tanks. the leader of the polish unit, kazimierz mastalerz, was killed in action during that engagement. on the same day, wiktorin's 20th infantry division also fought the battle of chojnice and, bypassing chojnice, captured nowa cerkiew.