Good one, Pete.
His father was in the GAR ( Grand Army of the Republic) in 1863 and,I believe, participated in the
defense of the city during the New York Draft Riots, as did Inspector Byrnes.
Pop Horner was super-pissed about what his son had done. The article states that Pop cut him out
of any inheritance Junior may have expected.
Company H, 17th Regiment, New York State Volunteers, 1863-1865
https://museum.dmna.ny.gov/unit-history/infantry/9th-infantry-regimentHorner, James B.
James B. Horner papers, 1861-1915.
Description: 1 box (ca. 300 items)
Abstract: Muster rolls, ordnance returns, and quartermaster returns of Company H, 17th Regiment, New York State Volunteers, 1863-1865, along with a few special orders, discharges, and a small group of personal papers, 1861-1915, of Major James B. Horner of New York City. Personal papers include invitations and ephemera pertaining to attendance of civic and military events, parades, etc.; along with a few military documents concerning his service in the 9th New York Infantry Regiment and a group of 1915 condolence letters written by associates in the military and pharmaceutical industry on the occasion of Horner's death in 1915, and addressed primarily to his business partner, Joseph Mathias.
Located at the New York Historical Society.