He enlisted on Jan. 4, 1864 into Company C of the 13th Indiana Volunteer Cavalry, where he was eventually promoted to Sergeant-Major. He was mustered out on Oct. 15, 1865, with the rank of Adjutant of Regiment.
In 1872, he established The Weekly Star in Greencastle. Thence moving to Bloomington, he became editor of the Bloomington Courier, a position he held until 1895. At that time he established the Weekly Star and organized the Feltus Printing Company.
He served as postmaster and on the Bloomington City Council.
Feltus married the former Catherine Ella Baird, and they had five children: Gertrude, Henry, Roswell ("Roy"), John, and Paul.