From the Jewish Encyclopedia, 1906:

Born in Richmond, Va., Aug. 5, 1843, and accompanied his father, Isaac Hyneman, to Philadelphia in 1850. He enlisted in the army Aug. 14, 1862, and was wounded at the battle of Fredericksburg. On recovery he was assigned to the United States Army Signal Corps—temporarily in April, 1863, and permanently on Aug. 17 of the same year. Hyneman took part in the battles of Chancellorsville, Brandy Station (where he was wounded), Gettysburg, Mine Run (where he was again wounded), Wilderness, Spottsylvania Court House, Cold Harbor, Five Forks, Petersburg, and Appomattox Court House, and was present at the surrender of Lee. He was mustered out of service June 24, 1865.

A few years after the war Hyneman joined the First Regiment of the Pennsylvania National Guard, and took part in subduing the riots at Susquehanna Station and Hazleton. When the Veteran Corps of the First Regiment of the Pennsylvania National Guard was formed, Hyneman joined it. He was elected first lieutenant April 19, 1880, and quarter-master, with the rank of captain, in 1883. He resigned April 17, 1891. During the railroad and mining riots at Pittsburg, Scranton, and Wilkesbarre during July and August, 1877, he raised two companies of National Guards of Pennsylvania, and commanded Company G, Twentieth Regiment. In 1889 he was appointed aide-de-camp, with rank of colonel, on the staff of Gen. William Warren, commander-in-chief of the Grand Army of the Republic.