The German army felt a dire need for self propelled guns early in the Second World War. The highest priority items were a motorized anti-tank gun more powerful than the 3.7 cm Pak and a more mobile 149 mm sIG 33 gun. This was a versatile weapon that could serve in several roles thanks to variable propellant loads, although the SPG would be used in direct fire. A 38 kg HE shell carrying almost 8 kg of explosives could demolish a brick house in a few hits. This ability was widely used in May-June of 1940 when the 15 cm sIG 33 (mot S) auf Pz.Kpfw.I Ausf.B went into battle. The first attempt at an SPG had issues. The vehicle was too tall and the Pz.Kpfw.I Ausf.B chassis was overloaded. Nevertheless, the tankers (as the 15 cm sIG 33 (mot S) auf Pz.Kpfw.I Ausf.B formed artillery batteries in tank divisions) appreciated this vehicle.
|Geschützwagen 38 für sIG 33/1 (Sf.), the most common German SPG with a 149 mm sIG 33 gun.
|The Voss II SPG could have looked like this if it was built.
|Geschützwagen 38 für sIG 33/1 (Sf.) prototype built at Alkett in November of 1942. Only a prototype was built in Spandau, production was never meant to happen here.
|The fighting compartment. The designers squeezed everything out of the base chassis, resulting in a more or less roomy fighting compartment.
|Production of the Geschützwagen 38 für sIG 33/1 (Sf.) at BMM. The Pz.Kpfw.38(t) Ausf.H chassis was converted to make them.
|A production Geschützwagen 38 für sIG 33/1 (Sf.).
|The vehicle looks tall, but its dimensions are not that different from the Marder tank destroyers.
|The fighting compartment was altered. The loader moved to where the commander used to be.
|The commander was moved to the left rear corner.
|Grille in Italy.
|The super-caliber HEAT shell could knock out any tank of the era, provided it hit the target.
|The Grille made its debut during the Battle of Kursk.
|This photo shows the dimensions of the vehicle. It's big, but not that big.
|Captured Grille at the NIBT Proving Grounds.
|Soviet sources called it SU-150.