Civil War Union Brigadier General. Appointed to attend the United States Military Academy at West Point, he graduated in 1835, 48th in his class, the same class as George Meade. He became a Brevet 2nd Lieutenant in the U.S. Infantry in 1835 and a 1st Lieutenant in 1839 while serving in the Seminole Wars in Florida. He was promoted to Captain while serving in the Mexican American War in 1847 and was brevetted to Major in 1849 for meritorious service. In 1850, he then resigned from the army, returned to New York and became a railroad executive and agricultural specialist. Patrick became the president of the New York State Agricultural College from 1859 until the start of the Civil War in 1861. He left his position and enlisted in the New York State Militia and was appointed as Inspector General. He was promoted to Brigadier General of U.S. Volunteers in March, 1862 and was assigned to commands during the Shenandoah Valley Campaign. He was briefly appointed as the Military Governor of Fredericksburg, Virginia in April before he was transferred to the Army of the Potomac to command a brigade in the 1st Corps. He commanded troops at the Battles of South Mountain, 2nd Bull Run, and Antietam. He was appointed by President Abraham Lincoln as the Provost Marshal for the Army of the Potomac on October 6, 1862 and was best remembered for trying to stop Union soldiers from looting and creating havoc at Fredericksburg. Marsena Patrick was appointed to serve at several unwanted, thankless, and difficult tasks as Provost Marshal throughout the war. He officiated executions, rounded up and corralled soldiers that ran from battle, interrogated prisoners, and enforced discipline and military codes involving insubordination. He was eventually promoted to Brevet Major General of U.S. Volunteers. After the war, he governed the District of Henrico in the Department of Virginia before resigning his commission on June 12, 1865. He returned to New York and became the President of the New York State Agricultural Society in 1867, and became a state commissioner in 1868. He later moved to Ohio to accept a position as Governor of the Central Branch of the National Home for Disabled Veterans in Dayton.