During the operations, the Crown Prince won the reputation of a thorough soldier. After peace was made and Saxony had entered the North German Confederation, he gained the command of the Saxon army, which had now become the XII army corps of the North German army, and in that position, he carried out the necessary reorganisation. He proved a firm adherent of the Prussian alliance. On the outbreak of the Franco-Prussian War in 1870, he again commanded the Saxons, who were included in the 2nd army under Prince Friedrich Karl of Prussia, his old opponent. At the Battle of Gravelotte, they formed the extreme left of the German army, and with the Prussian Guard carried out the attack on St Privat, the final and decisive action in the battle.