Civil War Union Brevet Brigadier General. He briefly attended the United States Military Academy at West Point, New York as a young man before becoming a businessman in Chicago, Illinois. He then returned to his native Massachusetts, where he would continue his business interests while becoming entrenched in the Massachusetts Militia. When the Civil War started in April 1861 his militia company, which he commanded as Captain, became part of the 8th Massachusetts Militia, and was sent to Baltimore, Maryland to perform garrison and guard duty. When the unit was mustered out of Federal service in August 1861, he immediately rejoined the Union war effort, and was commissioned as Lieutenant Colonel of the 19th Massachusetts Volunteer Infantry on August 3rd. He was with the regiment during the September 17, 1862 Battle of Antietam, where it was part of the disaster that befell the division of Major General John Sedgwick, which was cut to pieces by Confederates in the West Woods area. Arthur Devereux and regimental commander Colonel Edward Winslow Hincks were both wounded, the latter severely. On November 29, 1862 Arthur Devereux was promoted to Colonel and commander of the unit. He led it through the December 1862 Fredericksburg Campaign, the May 1863 Chancellorsville Campaign, and the July 1863 Battle of Gettysburg. At Gettysburg his unit was positioned near the famed "Copse of Trees" on Cemetery Ridge, and was ordered into a breech in the line by Major General Winfield Scott Hancock during Pickett's Charge on the Third Day of the Battle (July 3, 1863). There his men sealed a gap in the Union line, defending it from attacking Confederates in hand-to-hand fighting. Ultimately repulsing the rebels, the 19th Massachusetts would capture four Confederate regimental flags. After the battle he served time on recruitment and garrison command in Massachusetts before returning to the Army of the Potomac during the Fall 1863 Mine Run Campaign. He commanded a brigade in the II Corps until February 27, 1864, when he resigned from the service. He was brevetted Brigadier General, US Volunteers on March 13, 1865 for "gallant services during the war". He returned to pursue his business in Massachusetts, but later moved to Cincinnati, Ohio, where he became a newspaper journalist and editor, and served in the Ohio State Legislature. He passed away in 1906. A memorial plaque to General Devereux is affixed to his family's tomb in Broad Street Cemetery in Salem, Massachusetts.