Featuring the biggest anti-tank cannon already installed in any vehicle, the Sd.Kfz 186 Jagdtiger was developed from the chassis of the Tiger II with a fixed structure in place of the tower. About 85 vehicles were produced until the war ended, Manning only two units. The most successful action occurred in Neustadt, in March 1945, where three Jagdtigers destroyed 25 M4 Shermans and M10 without loss, although achieved. Despite their power, however, was extremely vulnerable due to their size and slowness, and subject to frequent breakdowns.