After leaving the Army, he returned to New York in 1854 and assisted his father George as the Assistant Editor of the New York Home Journal. Morris and Charles L. Brown are credited with a patent for an improved firearm with a conical cylinder holding 8 cartridges which was patented in 1860.
Civil War
In August, 1861, Morris re-enlisted in the Army as a captain of volunteers. He served on the staff of Brigadier General John J. Peck as Assistant Adjutant General of Peck's brigade during the Peninsula Campaign and from June 24, 1862 to September 1, 1862 as assistant adjutant general of Division 2, IV Corps, Army of the Potomac, after Peck was appointed commander of the division. Morris participated in the Siege of Yorktown, Battle of Williamsburg and Battle of Fair Oaks. On September 1, 1861, Morris resigned his commission in the volunteers and the following day was commissioned colonel of the 135th New York Volunteer Infantry Regiment, which was redesignated the 6th New York Heavy Artillery Regiment in October. Colonel Morris's regiment served in the Middle Department in the defense of Baltimore. On March 16, 1863, Morris was promoted to brigadier general of volunteers to rank from November 29, 1862 and served in the Middle Department from December 1862 until June 1863. During the Battle of Gettysburg, Morris's brigade was in reserve. When Major General William H. French took over command of the battered III Corps, Morris's brigade was transferred to 1st Brigade, 3rd Division, III Corps, Army of the Potomac on July 10, 1863. The 3rd Division participated in the pursuit of Lee's army after the Battle of Gettysburg, with Morris's brigade in action during the Battle of Manassas Gap on July 23, 1863. Morris served in the Bristoe Campaign from October to December 1863, and fought in the Battle of Mine Run in November 1863. In 1864 he fought in the Battle of the Wilderness. During the Battle of Spotsylvania Court House, on the morning of May 9, 1864 he rode on horseback to inspect his brigade and was shot and wounded in the right knee by a sharpshooter. Morris was on leave of absence until June and saw no more field service after suffering his wound. From June to August 1864 he served on the Courts Martial and Military Commissions. Still suffering from his wounds, he was mustered out of service at the end of August, 1864. During this time General Morris wrote a book, Infantry Tactics, which was published in 1865. President of the United StatesAndrew Johnson nominated Morris for appointment as a brevet major general of volunteers to rank from March 13, 1865 and the United States Senate confirmed the appointment on March 28, 1867.
After the war Morris lived on his estate, Briarcliff, in Putnam County, New York. He edited the New York Home Journal. He also served at the Constitutional Convention of the State of New York, as a delegate for Putnam County in 1866. Like his father, he continued to serve in the New York State Militia, as the Chief of Ordnance of the State of New York as brigadier-general, 1869-1870 and inspector-general 1873-1874. Charles L. Brown had died at the Battle of Malvern Hill in 1862 but Morris modified their patent with both their names and it was reissued in 1871. Morris also published a follow-on book, "Tactics for Infantry, armed with Breech-loading or Magazine Rifle" in 1879, revised in 1888. He lobbied the U.S. War Department to adopt ideas expressed in the book. Morris died August 26, 1900, while vacationing at Long Branch, New Jersey and is buried in Cold Spring, New York.
