During the Franco-Prussian War Voigts-Rhetz‘s X Corps became part of the 2nd Army, again led by Prince Friedrich Karl. With these troops Voigts-Rhetz took part in the battles at Mars-la-Tour and Gravelotte. After Gravelotte, X Corps was part of the troops besieging Metz. After the fall of Metz Voigts-Rhetz and X Corps were sent to the Loire, where he was victorious at Beaune-la-Rolande. After the end of the war he remained in command of the Corps until he retired in 1873 due to health reasons. He was given a dotation of 150.000 thaler for his services during the war.