Kammala wannan jumla: Duke Charles ya shiga aikin Prussian a lokacin da yake matashi. A lokacin da yake da shekaru 19 ya gudanar da kwamiti a matsayin Kyaftin kuma a 1806 an ci gaba da shi zuwa Major. Ya yi yaƙi don ɗan'uwansa a cikin doka Sarki Frederick William III na Prussia a lokacin yakin basasa.
Yaƙin Hadin Gwiwa na Hudu yana rakiyar sarki a cikin tserensa bayan shan kashi na Prussian a Yaƙin Jena-Auerstedt. Don hidimarsa a yakin Saale Duke Charles ya sami lambar yabo ta Black Eagle.