StuG III Ausf. As heading East.
Trivia-bit: Ausf. A possessed the ten-speed Maybach Variorex SRG 328 145 transmission, providing max. speed of 67. 1 km/hr at 10. gear.
Refer: Doyle & Jentz: "Sturmgeschütz Assault Gun 1940-1942", "Panzer Tracts 8: Sturmgeschütz".