Matheny, John of Nashville, Ind. Aug. 9, 1862 capt., Co. H, 82nd Ind. Infantry Rgt. March 4, 1864 ltcol. Sept. 30 and Oct. 31, 1864 regimental commander; Nov. 15-Dec. 21, 1864 commanded regiment during Savannah, Ga. (March to the sea) campaign and January-April 1865 Carolina campaign; June 9, 1865 mustered out at Washington, D. C.
(NOTE: Col. Morton Hunter of 82nd Ind. Infantry served as brigade commander on/between the same dates)

Source: Official Records of the War of the Rebellion; Indiana Adjutant General Records

I couldn't determine which John Matheny was correct in any of the US Census I looked it (1860, 1870, 1880). He is not listed in the pension index.