Jagdpanther had a cannon that was previously used on the German heavy tank used during what event?
Jagdpanther The Jagdpanther (German: "hunting panther"), SdKfz 173, was a tank destroyer built by Nazi Germany during World War II based on the chassis of the Panther tank. It entered service in 1944 during the later stages of the war on the Eastern and Western Fronts. The "Jagdpanther" combined the 8.8 cm KwK 43 cannon of the Tiger II and the armor and suspension of the Panther chassis, although it suffered from the general poor state of German ordnance production, maintenance and training in the later part of the war, which resulted in small production numbers, shortage of spare parts and poor crew readiness.
15 cm Kanone M 80 The 15 cm Kanone M 80 was a siege gun used by Austria-Hungary during World War I. Designed to replace the M 61 series of siege guns the M 80 family of siege guns offered greater range and armor penetration than the older guns. The proven steel-bronze (92% copper bronze strengthened by autofrettage) was used for the barrel and the iron carriage lacked any system to absorb recoil other than the traditional recoil wedges placed underneath and behind the wheels of the carriage. These wedges helped to absorb the recoil force and encouraged the wheels to run forward to bring the gun back into battery. Generally a wooden firing platform was constructed for these guns in action to provide a level and smooth surface. Shortly after these guns were adopted a hydraulic recoil cylinder was adapted to absorb the recoil forces. It was attached to the underside of the carriage and the firing platform. For transport the barrel was removed from the carriage by a crane and carried separately.