The battle of Piotrkow was a defensive rearguard action and one of the many such victories for the Poles during the campaign. Polish losses were 7 tanks, and the 1st Panzer Division lost about 78 tanks knocked out plus more damaged.
1st Panzer finally meets it's end for the Polish Campaign in the dual battle of Ruszki and Kiernozia, where the Polish Bzura counter-offensive nearly wipes out 1st and 4th Panzer Divisions (both escape, but barely, and with less than 30% of the original tank allotment). Ruszki and Kiernozia end up being named "Hell at Kiernozia" by German survivors of the battle, with Oberst Eberbach of PzRg 35 writing that it "was like being in the Devil's Kettle." Panzer Regiment 35, in support of 1st Panzer, also loses 23 tanks knocked out and 6 damaged in the engagement, and both 1st and 4th Panzer withdrawal from Poland a couple days later with fewer than 80 tanks each. To put that in perspective, 1st and 4th combined started the campaign with over 600 tanks.
Panzer IV Number I01, belonging to the battalion commander of 1st Battalion, Panzer-Regiment 1. All were killed after it was either hit by artillery, or the ammunition exploded, somewhere in the vicinity of Ruszki.
