As a result of the Treaty of Campo Formio in 1797, the Fricktal became a French protectorate, forming the front line between the French Revolutionary and the Austrian troops in the War of the Second Coalition.
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The brief tenure of office of the cantonal heads Joachim Heer (1798), Johann Jakob Heussi (1798–99), Felix Christoph Cajetan Fuchs (1799), Niklaus Heer (1799–1802) and Franz Josef Büeler (1802–03) reflected the military and political turmoil plaguing the region, which was under French occupation from 1799, during the War of the Second Coalition, with serious effects on the local economy.
He was a successful commander during the War of the First Coalition in the region of Piemont 1797 and also during the War of the Second Coalition around Taufers (South Tyrol) and Susch (Engadin) in 1799 against Napoleon Bonaparte’s army.