Flames of War: Panzerjager I Anti-tank Platoon (GBX197)German High Command recognised the need for a specialised vehicle capable of engaging enemy tanks with a weapon of greater penetrating power than the 3. 7cm PaK36 anti tank gun. The Germans mounted a Czech 4. 7cm anti tank gun on a Panzer I chassis with a gun shield to protect the crew. The result was the Panzerjager I. The 15 cm sIG 33 (Sf) auf Panzerkampfwagen I Ausf B, sometimes referred to unofficially as the Sturmpanzer I Bison, mounts a 15cm