During the War of the Sixth Coalition against France, in 1813 Colonel Hermann von Boyen prompted to work sconces south of Runder Berg (today's Kreuzberg) and the other hills of the Tempelhofer Berge range. Plantations of about 4,000 fruit trees were stubbed and levelled. Citizens of Berlin were draughted to work the sconces supervised by Captain Woldemar von Loos, among them also prominent figures such as Johann Gottlieb Fichte, August Wilhelm Iffland and Johann Gottfried Schadow. On top of the Kreuzberg, protected by the sconce on its southern slope, a redoubt was built comprising seven bomb-safe powder magazines, two huts for altogether 500 men, officially called the Citadel of Berlin.