Richard Arnold, son of Rhode Island governor and United States congressman Lemuel Arnold, was born in Providence in 1828. His was an old Rhode Island family, and included the infamous Benedict Arnold. An 1850 graduate of West Point, Richard Arnold initially saw service as an artilleryman in Florida, Maine, and California. Then he was selected by General John Wool as a staff officer. For six or seven years he was the general’s aide-de-camp and was involved in Indian affairs in Oregon and Washington. When the Civil War began, Arnold became captain of Battery D, 2nd United States Artillery.
As the Union army’s fortunes began to wane at the First Battle of Bull Run on the afternoon of July 21, 1861, General Irwin McDowell and his staff made an effort to rally troops on the high ground near the Matthews house. His assistant adjutant general, Captain James Fry, later wrote, “There, I went to Arnold’s battery as it came by, and advised that he unlimber and make a stand as a rallying point, which he did, saying he was in fair condition and ready to fight as long as there was any fighting to be done. But all efforts failed.” Arnold joined regular units of infantry and cavalry in an attempt to cover the rear of the routed Union army, and in the process his battery lost all of its guns.
Despite his disaster at Bull Run, Arnold was in command of the artillery of General William B. Franklin’s division at the beginning of the Peninsula fighting. Soon after, Franklin took command of the newly organized 6th Corps, and appointed Arnold his acting inspector general. As such, he was brevetted major for services rendered at the Battle of Savage’s Station. Then a bout with typhoid fever led him to a three months sick leave.
In late 1862, after his recovery, Arnold traveled to Louisiana and a new position as brigadier general and chief of artillery of the Department of the Gulf. As such he participated in the Port Hudson and Red River campaigns, and in the shakeup following General Nathaniel P. Banks’s failure in the latter campaign, he was put in command of the cavalry. During the operations against Mobile, General Arnold was chief of artillery, and his 25 guns and 16 mortars were instrumental in forcing the surrender of Fort Morgan in August 1864. After that campaign, the general obtained a leave of absence. Then, in November 1864, the war at the front ended for Richard Arnold. He was assigned to a retirement board for disabled officers in Wilmington, Delaware, and there he sat out the remainder of hostilities.
At the end of the war he was brevetted to the rank of Major general in both the regular and volunteer service, but his regular rank was captain of the 5th United States Artillery. In 1866 he was assigned to the command of a battery stationed in Little Rock, Arkansas. The remainder of his life was spent on a succession of posts. In 1875 he was promoted major, and in 1882 he rose to lieutenant colonel. Five days after that promotion, while doing duty as acting inspector general of the Department of the East, General Arnold died at Governor’s Island, New York. He is buried in Swan Point Cemetery in Providence.