The Reduit Tilly is the core of the bridgehead of the Ingolstadt state fortress on the southern bank of the Danube. It was built from 1828 to 1841 under King Ludwig I according to plans by his court architect Leo von Klenze and the fortress builder Major General and head of the engineering corps Michael von Streiter in the classicist style. The semi-circular, two-story building, closed off from the shore by the so-called infantry wall, was intended to accommodate guns and troops in its barrel-shaped casemates. It was also intended to offer refuge to the Bavarian royal family along with the crown jewels in the event of an invasion. Two flank batteries and the oval fortifications Tower Triva and Tower Baur are attached to it on the side. It is named after the commander of Bavaria in the Thirty Years' War, Johann T'Serclaes von Tilly. In connection with the 1992 state garden show, the reduit was renovated and integrated into the Klenzepark. Today it houses the permanent exhibition of the Bavarian Army Museum on World War I.