 Ninety chassis that had already been built were converted into self-propelled anti-tank guns; these were put into service in 1943 as the Panzerjäger Tiger (P) and known by the nickname "Ferdinand".The Ferdinand was driven by a hybrid electric powertrain, and was armed with a long barrel version of the 88mm Flak cannon.The most common reason for losses was because the vehicle became stuck or broke down, and so the crews often had to destroy their own vehicles to avoid allowing them to be captured.