The SdKfz 124 Wespe (German for wasp) or (Leichte Feldhaubitze 18 auf Fahrgestell Panzerkampfwagen II) was a German self-propelled artillery vehicle developed and used during the Second World War. It was based on the Panzer II tank.In 1940, during the Battle of France, it was apparent that the main tank of the German forces, the Panzer II, was unsuitable as a direct combat vehicle; though mechanically sound, it was both under-gunned and under-armoured. Thus, when the need arose for a self-propelled artillery vehicle, the Panzer II was a natural choice, removing the vehicles from front line service and extending their usable lifespan. (source)