Early 1941. Though outdated, amphibious tanks like the T-40 were still highly valued by the Russian Army in 1941.

T-40

Anywhere in Soviet Union, 1941. Impressive armament: one 76.2mm tank gun, two 37mm tank gun,  five MGs. But poor armour (30mm max). Max speed: 30km/h. Crew: 11   

Knocked out T-35

The Su-152 mounts a ML20 howitzer, a commmon Russian gun. It can fire 2-3 rounds up to 17km in a minute. Why so slow? the 152mm shell came in two pieces. Su-152s first saw service at Kursk and claimed 12 Tiger tanks and 7 Elefants.