A Portrait and Biographical Record of Hendricks County (Chicago: A.W. Bowen & Co., 1895)--page 1008
Henry C. Hadley, ex-treasurer of Hendricks County, and an old soldier, is a native of this county and a son of Jehu Hadley, who was a son of James T., the son of Simon, the son of the original Joshua and Ruth (Lindley) Hadley, the pioneers and founders of the Hadley family in Indiana. Henry C. Hadley was born May 21, 1841, on his father's farm, in Franklin Township; he received a good common school education, but left home at the early age of thirteen years and went to Montgomery County, O., where he attended school in winter and worked on a farm in summer for two seasons; then attended the graded school one year, at Dayton, and high-school, of the same city, for another year; then returned to his home and enlisted in August, 1861, at Clayton, in Company A, Eleventh Indiana Volunteer Infantry, for three years, under Capt. George Butler and Col. Lew Wallace, and served until honorably discharged at Halltown, Va., late in 1864, after having served in the battles of Fort Henry, Fort Hindman, Fort Donelson, at Shiloh, in several battles in the rear of Vicksburg, at Champion Hills, and for forty-four days in the siege of Vicksburg; he also was in the battle of Jackson, Miss., and was later on detailed duty at New Orleans. He had been promoted to be corporal and sergeant during the siege of Vicksburg, and at New Orleans was detailed as orderly-sergeant to command a battery at Fort Connolly. He was next transferred, with his regiment, to the Shenandoah Valley, under Gen. Phil Sheridan, and here his service closed. On returning to Hendricks County, Mr. Hadley attended a commercial college at Indianapolis, and was then for four years employed as clerk in wholesale houses; was next engaged in the cattle trade for ten years on his own account, and then, for a year in the mercantile business. Politically Mr. Hadley is a Republican, and cast his first presidential vote for Abraham Lincoln. In 1884 he was elected treasurer of Hendricks County, and served two years; fraternally, he is a Knight of Pythias, and is also a member of Joseph Fleece post, G.A.R., of North Salem.