Franz von Weyrother was chosen by Generalmajor Major General Graf Wenzel Colloredo as his adjutant from 1779 until 1783 and the following year he was promoted to Oberlieutenant.
In August 1779, he was chosen by Generalmajor Major General Graf Wenzel Colloredo as his adjutant and stayed in post until 1783. On 1 June 1784, he was promoted to Oberlieutenant and after his transfer on 1 August 1787 to Infanterie-regiment Nr. 
