Henry J. Hunt

Henry Jackson Hunt (September 14, 1819 – February 11, 1889) was Chief of Artillery in the Army of the Potomac during the American Civil War. Considered by his contemporaries the greatest artillery tactician and strategist of the war, he was a master of the science of gunnery and rewrote the manual on the organization and use of artillery in early modern armies. His courage and tactics affected the outcome of some of the most significant battles in the war, including Malvern Hill, Antietam, Fredericksburg, and most notably at Gettysburg, where his operational decisions contributed greatly to the defeat of Pickett's Charge.
https://en.wikipedia.org/wiki/Henry_Jackson_Hunt