This iteration of the Department of the South consisted of posts in Georgia, Alabama and Florida, in what was then the Third Military District.
During his last years in the military, he served some time under General George Meade as Inspector General of the Department of Georgia, which had been created by the military in 1865 as part of the Third Military District during the post-war Reconstruction period.
Captain Sanderson was transferred to 33rd U.S. Infantry 21 Sept 1866 and served as Acting Assistant Adjutant-General (AAAG), on the staff of Brevet Major General Pope commanding, Third Military District, at Headquarters (Atlanta, Georgia).
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In response, General George Meade (of the Third Military District) installed Brig. General Thomas H. Ruger as military governor and Jenkins fled the state, though he later returned.