Kammala jumla mai zuwa: An haife shi a Weißenfels a cikin Zabe na Saxony a 1735, Otto ya shiga rundunar Saxon a 1753 a matsayin doki. A cikin Yakin Shekaru Bakwai ya yi yaƙi a yakin Kolín da
Breslau a shekara ta 1757. Ya kuma kasance a cikin kewaye da yawa da kuma rikice-rikice. Ya shiga Freikorps na Austrian wanda ɗan'uwansa Wilhelm ya tashe shi kuma ya shiga cikin hare-hare da yawa da suka yi nasara a cikin 1760-1762.