The Russians were slow to realise the need for Self Propelled Mobile Artillery & Assault Guns. During Operation Uranus, the Russian Counter Attack at Stalingrad in November 1942 which sealed the German 6th Army's fate, they relied heavily on Engineers & Sappers to clear paths through German fortifications. This was costly as it left the soldiers exposed. So using the T-34 & KV-1 Tank Chassies they developed a series of Mobile Assault Guns and Tank Destroyers which proved they could match the Germans in just about every category, taking on the mighty Tiger & Panther Tanks at Kursk in July 1943 and going on to Spearhead many Russian operations there after. Top to Bottom. SU 76, SU 85, SU 100, SU 122 & SU 152. The SU 100 was considered the best Mobile Assault Gun of WW2 being able to take on any German Tank from a Range of 2000 metres with great accuracy. The shells from it's 100mm Gun able to punch through 125mm of Armour.