During invasion of Poland,german used Panzer I,II,III and IV as well as Czech tanks PzKpfw36(t) and PzKpfw(t). Panzer I was armed only with a machinegun and should not be part of this comparison. Geman mainstay during this period was Panzer II. Polish main tank during september 1939 was 7TPjw. Haw these tank compare?