Promoted to first lieutenant in 1823, Morris commanded the artillery in the Arickaree Expedition. Morris served in various garrison positions until 1836, when he was promoted to captain, 4th Artillery.He fought in the Second Seminole War, including the Battle of Wahoo Swamp, receiving a brevet major appointment for gallant conduct. During the Mexican-American War, Morris served as Major of the Artillery Battalion of the "Army of Occupation" and fought at the Battle of Palo Alto and Battle of Resaca de la Palma. Returning to the United States in 1848, Morris was promoted to major, 4th Artillery and served in various garrison and frontier positions.
 In early 1861, he was stationed at Fort Ridgely, Minnesota. On April 25, 1861, Morris was transferred to Fort McHenry, Baltimore, Maryland.
 On May 14, 1861, Morris was promoted to lieutenant colonel of the 4th Artillery Regiment in the Regular United States Army, followed by a promotion to colonel of the 2nd U. Artillery Regiment on November 1, 1861.  On April 30, 1862, President Abraham Lincoln nominated Morris for appointment to the grade of brevet brigadier general, Regular United States Army, for "meritorious services", to rank from June 9, 1862 and the United States Senate confirmed the appointment on June 9, 1862.
Morris served as a brigade commander primarily in charge of the defense of Baltimore Harbor from July 22, 1862, and served both in the Middle Department and its military organization, the VIII Corps, under Maj.  Morris temporarily commanded the VIII Corps and, for the most part simultaneously, the Middle Department (with the date of assumption or relinquishment of command of the department, if different, shown as the date assumed or relinquished in parentheses following the corps command dates): March 12, 1863 to March 22, 1863 (relinquished department command March 20, 1863); August 7, 1863 to August 31, 1863 (assumed department command August 10, 1863); September 22, 1863 to September 28, 1863; and, February 1, 1865 to April 19, 1865 (assumed department command January 30, 1865).  Together, they were the parents of:. In 1880, Morris was appointed a special agent for the U.
Porter in the 8th New York Regiment, and later in the Marine Corps. Morris died on December 11, 1865 at Fort McHenry in Baltimore, Maryland at age 64.
 He was buried at St. Ann's Episcopal Church graveyard in the Bronx.
On April 16, 1866, President Andrew Johnson nominated Morris for posthumous appointment as a brevet major general, for "Faithful and meritorious Services during the Rebellion", in the Regular United States Army to rank from December 10, 1865 and the United States Senate confirmed the appointment on May 4, 1866. This item is in the category "Collectibles\Militaria\Civil War (1861-65)\Original Period Items\Photographs". The seller is "civil_war_photos" and is located in this country: US. This item can be shipped worldwide.