with the same unit during the Utah War in 1857 against the Mormons. His permanent (regular army) promotions to captain and major were in 1852 and 1861, respectively. In 1856 Hunt was a member of a three-man board that revised field artillery drill and tactics for the army. The Instructions for Field Artillery manual written by the three (Hunt, William H. French, and William F. Barry) was published by the War Department in 1861 and was the "bible" of Northern field artillerists during the war. He was a principal proponent of the organizational doctrine that allowed infantry brigades to retain artillery batteries for close-in support, but that moved batteries formerly assigned to divisions and corps to an Artillery Reserve at the army level for more strategic control. Civil War First Bull Run through Chancellorsville Hunt achieved some fame in the First Battle of Bull Run in 1861, when his four-gun battery covered the retreat of a Union force with a close-in artillery duel. He soon afterward became chief of artillery in the Department of Northeast Virginia, defending Washington, D.C. As a colonel on the staff of Maj. Gen. George B. McClellan, Hunt organized and trained the artillery reserve of the Army of the Potomac and fought with it in the Peninsula Campaign. Throughout the war he contributed more than any officer to the effective employment of the artillery arm. With the artillery reserve at the Battle of Malvern Hill, his 250 guns repelled repeated Confederate infantry assaults with such gruesome efficiency that the Union infantry had little to do. He personally commanded a group of 60 guns that he employed as if they were a single battery (usually Union batteries contained six guns). On September 15, 1862, the day after the Battle of South Mountain, Hunt was promoted to brigadier general of volunteers and McClellan assigned him as chief of artillery in the Army of the Potomac for the imminent Battle of Antietam, where he deployed the Artillery Reserve to great effect. At the Battle of Fredericksburg in December, his gun emplacements on Stafford Heights effectively eliminated any possibility that Gen. Robert E. Lee could counterattack Union forces across the Rappahannock River. In the run-up to the Battle of Chancellorsville in May 1863, Hunt fell out of favor of Army of the Potomac commander Maj. Gen. Joseph Hooker and lost direct command of the Artillery Reserve, reducing him in effect