Panzergrenadier units in armoured half-tracks, trucks and field cars helped the infantry to keep pace with their armoured brethren. By the time of the invasion of Russia in 1941 the panzergrenadiers had equipped their troop leaders, half-tracks with the standard anti-tank gun of the day - the 37mm PaK 36. By replacing the front machine gun with this useful light gun the panzergrenadier units could rely on a modicum of fire support as they charged swiftly across the battlefield, supported by their platoon’s personnel carriers.