those tracks looks very worn out !
Sturmgeschütz-Abteilung 226 saw heavy battles against T-34s and KVs (incl. KV-2), as soon as they penetrated the Soviet border emplacements on 22 June 1941, around the River Bug. After ten days of battle, this unit had destroyed 107 Soviet tanks. Refer: "Sturmgeschütz vor" by Franz Kurowski. Also, the complete unit history is also being compiled by no other than Karlheinz Münch.
Btw - that's a nice commemorative pic of schwere Panzer-Abteilung 502 at Ploërmel, during the spring of 1943. s.Pz.Abt. 502 received 31 new Tigers in May '43. Refer: "Der Tiger Vol.2" by Volker Ruff, "TIK" by Wolfgang Schneider