Nathan Augustus Monroe Dudley (August 20, 1825 – April 29, 1910) was a soldier who served as a Colonel of Volunteers and sometimes as an acting Brigadier General of Volunteers for the Union Army during the American Civil War. He later served in the New Mexico Territory.
Dudley led the 30th Massachusetts Volunteers and spent time as an aide to Nathaniel Prentice Banks, Major General of Volunteers and commander of the XIX Corps. At the beginning of the War he was serving as a regular army captain, commanding Company E of the 10th U.S. Infantry Regiment. On January 19, 1865, President Abraham Lincoln, nominated Dudley for the award of the honorary grade of brevet brigadier general of volunteers to rank from the same date, January 19, 1865, and the U.S. Senate confirmed the award on February 14, 1865. After the War he reverted to his regular rank and transferred to the Third U. S. Cavalry. He eventually was promoted to Lt. Colonel of the Ninth Cavalry and finally to Colonel of the First U. S. Cavalry. He spent much of his career on the Indian frontier, and did much good service which has been somewhat overshadowed by his part in the Lincoln County War. He was well liked by his men, often not so well liked by his fellow officers. He was convicted at two Courts-Martial of offenses that could have ended his career, and Colonel Hatch of the Ninth Cavalry tried to get Dudley retired as being unfit for service due to alcohol. Dudley, however, had friends in high places.
Dudley's part in the Lincoln County War of 1877-1879 in New Mexico Territory is at best controversial and at worst despicable and incompetent. He was the commanding officer of the local Fort Stanton. Despite orders not to interfere in civilian matters, he did, nominally to protect civilians, but in fact, he seems to have favored the Murphy-Dolan faction throughout the range war. Attempts to have him removed as commander went all the way to the Secretary of War, but were refused. Susan McSween, the wife of one of the key participants, Alexander McSween, had charges filed in 1879 against Dudley.