Rubuta ci gaba don wannan sakin layi - Ya ci gaba da jin daɗin tagomashin sarki kuma an ba shi mukamin janar na sojan ƙasa (1869), amma ƙyamar takaicin da ya yi a 1866 bai taɓa barin shi ba. Ya yi furfura a shekara arba'in da biyu, kuma lafiyarsa ta raunana. A cikin 1869 von der Tann-Rathsamhausen, kamar yadda ake kiransa yanzu, an nada shi kwamandan I. Bavarian Corps. Ya umurci wannan rukunin a lokacin Yaƙin Franco-Prussian na 1870/71, kuma a cikin wannan yaƙin ne ya tabbatar da sunansa a matsayin ɗaya daga cikin manyan sojojin Jamus. Ya kasance sananne a yakin Wörth da Sedan. An canja shi a cikin kaka zuwa umurni mai zaman kanta a kan Loire, ya gudanar da ayyukan da d'Aurelle de Paladines, da farko tare da nasara mai nasara, kuma ya tilasta mika wuya na Orléans. Yana da, duk da haka, a Coulmiers
don ba da hanya a gaban dakarun Faransa da suka fi yawa; amma an ƙarfafa shi, ya yi yaƙe-yaƙe da yawa a ƙarƙashin Babban Duke na Mecklenburg-Schwerin kusa da Orléans.