Grille K self-propelled infantry guns are far more flexible than the towed models. They can still operate as artillery, but when needed can drive forward, using the protection of their armour, to bring the enemy under direct fire for faster results. 2. Panzerdivision and Panzer Lehr Division were issued platoons of three, making the firepower of their self-propelled infantry guns more effective, especially when used to fire as artillery.