In August 1791, in consultation with French émigré nobles and Frederick William II of Prussia, he issued the Declaration of Pillnitz, in which they declared the interest of the monarchs of Europe as one with the interests of Louis and his family.
During the French Revolutionary Wars, he served in the Imperial Army of the Upper Rhine, under command of General of Cavalry Dagobert Sigmund von Wurmser.
Dagobert Sigmund von Wurmser (1724–1797), Austrian general during the Napoleonic Wars
Sigmund Freud | Johann Wolfgang von Goethe | Otto von Bismarck | Alexander von Humboldt | Wernher von Braun | Carl Maria von Weber | Herbert von Karajan | Gebhard Leberecht von Blücher | John von Neumann | Lars von Trier | Ferdinand von Mueller | Paul von Hindenburg | Alexander von Humboldt Foundation | Heinrich von Kleist | Anne Sofie von Otter | Erich von Stroheim | Max von Sydow | Justus von Liebig | Hermann von Helmholtz | Franz von Papen | Die Meistersinger von Nürnberg | Carl von Clausewitz | Von Ryan's Express | Richard von Weizsäcker | Theodore von Kármán | Manfred von Richthofen | Erich von Däniken | Dita Von Teese | Albrecht von Haller | Sigmund Romberg |
The Lines were stormed on 13 October 1793 by an allied army under Austrian General Dagobert von Wurmser in the First Battle of Wissembourg.
In 1796 Fröhlich was promoted to Feldmarschall-Leutnant and commanded a mixed column of Austrian, Émigré and Kreis-Armee soldiers on the left wing of the Army of the Upper Rhine under Dagobert Sigmund von Wurmser.
After Dagobert von Wurmser's defeat at the Battle of Bassano on 8 September, Ott led the Austrian advance guard with great distinction during Wurmser's dash to Mantua.