(1843 - 1878)
Home State: Pennsylvania
Branch of Service: Infantry
Son of a career US Navy officer, in 1860 he was a 17 year old living with his parents in Carlisle, PA, known by Kennedy. He enlisted for three months' service as a Private in Company C of the 9th Pennsylvania Infantry on 23 April 1861 and mustered out with them on 29 July. He enlisted again, in Carlisle on 27 August 1861 and mustered as a Private in Company A, 7th Pennsylvania Reserves on 25 October 1861 at Camp Pierpoint in Langley, VA.
On the Campaign
He was with his Company on South Mountain and at Antietam in September 1862.
The rest of the War
He transferred as First Lieutenant to the 12th Tennessee Cavalry on 1 February 1864 and was detailed as aide-de-camp to Brigadier General A.C. Gillem, commander of the 4th Cavalry Division, and remained with the General into September 1865. He was appointed Major and Assistant Adjutant General, US Volunteers on 4 September 1865 and was honored by brevets to Captain and Major of Volunteers in March 1865 for his war service.
After the War
He was commissioned 2nd and First Lieutenant, 6th United States Infantry in the Regular Army on 20 November 1865, and promoted to Captain and Commissary of Subsistence on 23 February 1867. He received further brevets to Major and Lieutenant Colonel, USA for his war service in March 1867. He had service with President Andrew Johnson, dates not given.
Washington, Jan 22 
No little excitement was caused in public places here this evening by the report, which proved to be correct, that Brevet Lieut.-Col. and Capt. Andrew K. Long, Commissary of Subsistence at this post, had committed suicide. The particulars, as far are as known, are that Capt. Long went to his home at the usual hour this afternoon, and, entering his wife's room, had a brief conversation with her, and immediately afterward passed into an adjoining room, and shot himself near the heart with a revolver, causing death almost immediately. No cause is given, though it is reported that he had been drinking heavily for the past two or three days ...
References & notes
Basic information from Bates,1 the Card File,2 and Heitman.3 His presence on the Maryland Campaign and other details from Henry.4 Tennessee service from his Compiled Service Records.5 Personal details from family genealogists and the US Census of 1860. His death, quoted above, from the New York Times of 23 January 1878. His gravesite is on Findagrave. He was originally buried at Oak Hill Cemetery, Georgetown, DC, and removed to Arlington Cemetery in 1897.
He married Elizabeth Donnel Foster (1842-1926), daughter of Pennsylvania Congressman Henry Donnel Foster (1809-1880) in 1866 and they had 3 children.
More on the Web
See an interesting c. 1805 family portrait of his father and his siblings, and their mother, over on the blog.
04/06/1843; Baltimore, MD
01/22/1878; Washington, DC; burial in Arlington National Cemetery, Arlington, VA
1 Bates, Samuel Penniman, History of the Pennsylvania Volunteers, 1861-65, Harrisburg: State of Pennsylvania, 1868-1871 [AotW citation 28635]
2 Commonwealth of Pennsylvania, Adjutant-General, Pennsylvania Civil War Veterans' Card File, 1861-1866, Published <2005, first accessed 01 July 2005, <http://www.digitalarchives.state.pa.us/archive.asp?view=ArchiveIndexes&ArchiveID=17> [AotW citation 28636]
3 Heitman, Francis Bernard, Historical Register and Dictionary of the United States Army 1789-1903, 2 volumes, Washington DC: US Government Printing Office, 1903, Vol. 1, pg. 639 [AotW citation 28637]
4 Henry, Guy Vernor, Military Record of Civilian Appointments in the United States Army, 2 Volumes, New York: D. Van Nostrand, 1873, Vol. 1, pp. 30-31 [AotW citation 28638]
5 US War Department, Compiled Service Records of Soldiers who served in US Volunteer organizations enlisted for service during the Civil War, Record Group No. 94 (Adjutant General's Office, 1780's-1917), Washington DC: US National Archives and Records Administration (NARA), 1903-1927 [AotW citation 28639]