Gouverneur Kemble Warren (January 8, 1830 – August 8, 1882) was an American civil engineer and United States Army general during the American Civil War. He is best remembered for arranging the last-minute defense of Little Round Top during the Battle of Gettysburg and is often referred to as the "Hero of Little Round Top". His subsequent service as a corps commander and his remaining military career were ruined during the Battle of Five Forks, when he was relieved of command of the V Corps by Philip Sheridan, who claimed that Warren had moved too slowly. A post-war court of inquiry found that Sheridan's relief of Warren was unjustified.
Early life Warren was born in Cold Spring, New York, and named for Gouverneur Kemble, a prominent local Congressman, diplomat, industrialist, and owner of the West Point Foundry. His sister, Emily Warren Roebling, would later play a significant role in building the Brooklyn Bridge. He entered the United States Military Academy across the Hudson River from his hometown at age 16 and graduated second in his class of 44 cadets in 1850. He was commissioned a brevet second lieutenant in the Corps of Topographical Engineers. In the Antebellum South, he worked on the Mississippi River, participating in the Pacific Railroad Surveys of possible transcontinental railroad routes, and, in 1857, mapping the Western United States, extensively exploring the vast Nebraska Territory, including Nebraska, North Dakota, South Dakota, part of Montana, and part of Wyoming. He served as the engineer on William S. Harney's Battle of Ash Hollow in the Nebraska Territory in 1855, where he saw his first combat. One region he surveyed was the Minnesota River Valley, a valley much larger than expected from the low-flow Minnesota River. In some places, the valley is 5 miles (8 km) wide and 250 feet (80 m) deep. Warren first explained the region's hydrology in 1868, attributing the gorge to a massive river that drained Lake Agassiz between 11,700 and 9,400 years ago. The great river was named Glacial River Warren in his honor after his death.
American Civil War At the start of the war, Warren was a first lieutenant and mathematics instructor at the United States Military Academy. He helped raise a local regiment for service in the U.S. Army and was appointed lieutenant colonel of the 5th New York Infantry Regiment on May 14, 1861. Warren and his regiment saw their first combat at the Battle of Big Bethel in Virginia on June 10, arguably the first major land engagement of the war. He was promoted to colonel and regimental commander on September 10. In the 1862 Peninsula Campaign, Warren commanded his regiment at the Siege of Yorktown and also assisted the chief topographical engineer of the Army of the Potomac, Brig. Gen. Andrew A. Humphreys, by leading reconnaissance missions and drawing detailed maps of appropriate routes for the army in its advance up the Virginia Peninsula. He commanded a small brigade (3rd Brigade, 2nd Division, V Corps) during the Seven Days Battles consisting of his own 5th New York along with the 10th New York. At Gaines Mill, he was bruised in the knee by a shell fragment but remained on the field. He continued to lead the brigade at the Second Battle of Bull Run, suffering heavy casualties in a heroic stand against an overwhelming enemy assault, and at Antietam, where the V Corps was in reserve and saw no combat.
Warren was promoted to brigadier general on September 26, 1862, and he and his brigade went to the Battle of Fredericksburg in December, but again were held in reserve and saw no action. When U.S. Maj. Gen. Joseph Hooker reorganized the Army of the Potomac in February 1863, he named Warren his chief topographical engineer and then chief engineer. As chief engineer, Warren was commended for his service in the Battle of Chancellorsville. At the start of the Gettysburg campaign, as Confederate General Robert E. Lee began his invasion of Pennsylvania, Warren advised Hooker on the routes the Army should take in pursuit. On the second day of the Battle of Gettysburg, July 2, 1863, Warren initiated the defense of Little Round Top, recognizing the importance of the undefended position on the left flank of the U.S. Army and directing, on his initiative, the brigade of Col. Strong Vincent to occupy it just minutes before it was attacked. Warren suffered a minor neck wound during the Confederate assault. Promoted to major general after Gettysburg (August 8, 1863), Warren commanded the II Corps from August 1863 until March 1864, replacing the wounded Maj. Gen. Winfield S. Hancock, and distinguishing himself at the Battle of Bristoe Station. On March 13, 1865, he was brevetted to major general in the regular army for his actions at Bristoe Station. During the Mine Run Campaign, Warren's corps was ordered to attack Lee's army. Still, he perceived that a trap had been laid and refused the order from army commander Maj. Gen. George G. Meade. Although initially angry at Warren, Meade acknowledged that he had been right. Upon Hancock's return from medical leave and the spring 1864 reorganization of the Army of the Potomac, Warren assumed command of the V Corps and led it through the Overland Campaign, the Siege of Petersburg, and the Appomattox Campaign. During these Virginia campaigns, Warren established a reputation for bringing his engineering traits of deliberation and caution to the role of an infantry corps commander. He won the Battle of Globe Tavern, August 18 to August 20, 1864, cutting the Weldon Railroad, a vital supply route north to Petersburg. He also won a limited success in the Battle of Peebles' Farm in September 1864, carrying a part of the Confederate lines protecting supplies moving to Petersburg on the Boydton Plank Road. The aggressive Maj. Gen. Philip Sheridan, a key subordinate of Lt. Gen. Ulysses S. Grant, was dissatisfied with Warren's performance. He was angry at Warren's corps for supposedly obstructing roads after the Battle of the Wilderness and its cautious actions during the Siege of Petersburg. At the beginning of the Appomattox Campaign, Sheridan requested that the VI Corps be assigned to his pursuit of Lee's army. Still, Grant insisted that the V Corps was better positioned. He gave Sheridan written permission to relieve Warren if he felt it was justified "for the good of the service". Grant later wrote in his Personal Memoirs,
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