[null and void]

BM-13N Katyusha on a Lend-Lease Studebaker US6 truck, at the Museum of the Great Patriotic War, Moscow (2006)

[Rebelbase]

I recall reading somewhere about the Soviets being down to nothing except for a group of Katusha rocket trucks to defend against a squad of German tanks on a flanking maneuver south of Stalingrad (IIRC).

The Katusha volley obliterated and stopped the German advance.