A Henschel design eventually won the contract and the Hs 129 ‘Panzerknacker’ (or, ‘Tank Buster’) entered service in December 1941. The first variants of the Hs 129 proved to be underpowered. After the fall of France, German engineers fitted a pair of French Gnome-Rhône 14M radial engines and the Hs 129 Panzerknacker began its stunning military service career. With these engines, the Hs 129B2 was equipped with two 7.92mm machine-guns and two 20mm cannon in nose. Another version replaced the 3cm cannon pod with an array of four additional 7.62mm machine guns, for a total of six machine-guns and two 20mm cannons. By 1944, it was apparent that the 3.7cm cannon was too old for tank-busting duty, and the Hs 129B3 received a massive firepower upgrade. The 3.7cm cannon pod was replaced with the 7.5cm gun from a Panzer IV!