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Alexander Moore (May 13, 1830 – September 30, 1910) was an Irish American United States Army officer who served during the American Civil War and American Indian Wars.

Biography
Alexander Moore was born in Ireland on May 13, 1830, and he later immigrated to the United States.

Civil War Service
At the outbreak of the American Civil War, Moore was appointed from Illinois as a First Lieutenant in the 13th Wisconsin Volunteer Infantry in October 1861. He served as an aide-de-camp to General Philip Kearny from October 1861 until that officer's death at the Battle of Chantilly, Virginia on September 1, 1862, and was promoted to Captain, Aide-de-Camp, United States Volunteers on November 10, 1862, and reappointed May 3, 1863. Moore served as a staff officer during the Chancellorsville Campaign and saw action at the Battle of Chancellorsville in late April and early May 1863. During the Gettysburg Campaign, Moore served on the staff of Major General Daniel Sickles, commander of the 3rd Corps of the Union Army of the Potomac, and he was present at the Battle of Gettysburg, Pennsylvania when Sickles lost his right leg from an artillery shell at the Trostle Farm on July 2, 1863. At the end of the war, Moore was breveted Major, U.S. Volunteers dated March 6, 1865, and Lieutenant Colonel, U. S. Volunteers on March 13, 1865, for gallant and distinguished conduct in several campaigns of the Army of the Potomac prior to the Battle of Gettysburg, and breveted Colonel, U. S. Volunteers on March 13, 1865, for gallant and highly meritorious conduct at the Battle of Gettysburg, Pennsylvania. Alexander Moore was honorably mustered out of the volunteer service on September 26, 1866.

Service in the West
On January 22, 1867, Moore was appointed Captain, 38th United States Infantry, then became unassigned on November 11, 1869. He was finally assigned as a Captain to the 3rd United States Cavalry on December 15, 1870. Moore was stationed with his company on the western frontier, and in early 1876, was ordered to move his Company F of the 3rd Cavalry to Fort Fetterman, Wyoming Territory, in order to participate in the Big Horn Expedition. During this campaign, which lasted from March 1-27, 1876, Moore was given command of the 5th Battalion, consisting of Company E of the 2nd U.S. Cavalry and F of the 3rd U.S. Cavalry and was in command of it at the Battle of Powder River, Montana Territory on March 17, 1876. Moore would be court-martialed for his actions during the battle in failing to support the remainder of the command during the attack on the Indian village, and he was found guilty and resigned from the Army on August 10, 1879.

Death
Alexander Moore died on September 30, 1910, and was buried with full military honors beside his wife in Section 3 of Arlington National Cemetery.