In 1832, Roon rejoined his regiment and was afterwards attached to the headquarters of General
von Müffling's corps of observation at
Krefeld, where he first became aware of the very inefficient state of the Prussian Army. In 1833, he was appointed to the Topographical Bureau at Berlin. In 1835, he entered the
Prussian General Staff, and, in 1835, he was promoted captain and became instructor and examiner in the military academy at Berlin. In 1842, after an illness of two years brought on by overwork, he was promoted to major and attached to the staff of the VII Corps, where he was again impressed with the inefficiency of the organization of the army, and he occupied himself with schemes for its reform. In 1844, as tutor to
Prince Friedrich Karl of Prussia, he attended the prince at
Bonn University and in his European travels. In 1848, he was appointed chief of the staff of the VIII Corps at
Koblenz. During
the disturbances of that year, he served under
Prince William, later king and emperor, in the suppression of the
insurrection at Baden and distinguished himself by his energy and bravery, receiving the 3rd class of the
order of the Red Eagle in recognition of his services. While attached to the prince's staff at that time, Roon broached to the prince his schemes of army reform. In 1850, after the revelation of defective organization and efficiency that led to the humiliating
Treaty of Olmütz, Roon was made a lieutenant-colonel and, in 1851, full colonel. == Army reform ==