Sorry, no info precise info about the KV. The war is full of freak accidents, perhaps the commander got the hatch? Anyway, the soldiers and the vehicles on the background are German.
About the Marder: "On January 1944, the 71. Inf.Div. had quickly been transferred to the area south of Rome, and beginning in February 1944 it was in action in the Monte Majo mountain area during the battle for Cassino. After suffering severe losses and barely escaping encirclement by Allied troops several times during the 3rd battle for Cassino (German counting) the division was practicaly destroyed until May 20, 1944. Pz.Jg.Abt. 171 had lost almost half of its Marders and assault guns."