Question: Of the American Civil War generals ( Union ) who received a brevet on March 13 , 1865 , which one was the oldest ?

text: List of American Civil War generals (Union)
Union generals -- A

The following lists show the names, substantive ranks, and brevet ranks (if applicable) of all general officers who served in the United States Army during the Civil War, in addition to a small selection of lower-ranked officers who received brevets as general officers; while some 1,600 officers received or were nominated for brevets as general officers in the course of the war (or immediately following it for service during the war), only a small selection is listed here; only those who were killed in action, served as department heads within the army, had revoked or incomplete appointments or became U.S. President are listed here. In addition to their names and ranks, there is a small set of notes after every entry listing Medal of Honor or Thanks of Congress citations, West Point graduation dates, important political or Army offices held, retirements or deaths during the war (whether in action or other means), notable relations, rejections or expiration of appointments, or unique facts pertaining to this article (i.e. youngest general, last surviving general, etc. ); for all other information on their lives and accomplishments, please refer to their individual entries. If available, ranks are followed by the to rank from dates (i.e. the date on which the commission is effective) rather than the date of appointment or confirmation, which were generally months if not years later; this is particularly true in the case of brevets, most of which were granted after the war between 1866 and 1869. Note on abbreviations:
Name Substantive rank Brevet rank Notes
Abbott , Henry Livermore Major , USV ( October 10 , 1863 ) Brigadier general , USV ( March 13 , 1865 ) KIA , Battle of the Wilderness ( May 6 , 1864 )
Abercrombie , John Joseph Colonel , USA ( February 25 , 1861 ) Brigadier general , USV ( August 31 , 1861 ) Brigadier general , USA ( March 13 , 1865 ) USMA , 1822 Resigned June 24 , 1865
Allen , Robert Colonel , USA ( February 19 , 1862 ) Brigadier general , USV ( May 23 , 1863 ) Major general , USA ( March 13 , 1865 ) Major general , USV ( March 13 , 1865 ) USMA , 1836
Alvord , Benjamin Major , USA ( June 22 , 1854 ) Brigadier general , USV ( April 15 , 1862 ) Brigadier general , USA ( April 9 , 1865 ) USMA , 1833
Ames , Adelbert Captain , USA ( June 11 , 1864 ) Brigadier general , USV ( May 20 , 1863 ) Major general , USA ( March 13 , 1865 ) Major general , USV ( January 15 , 1865 ) USMA , 1861 MOH , First Battle of Bull Run ( July 21 , 1861 ) Provisional Governor Mississippi ( 1868-1869 ) U.S . Senator from Mississippi ( 1870-1874 ) Governor of Mississippi ( 1875 ) Last surviving Union General , d. April 13 , 1933 Son-in-law of Benjamin Franklin Butler
Ammen , Jacob Brigadier general , USV ( July 16 , 1862 )  USMA , 1831 Resigned January 14 , 1865
Anderson , Robert Brigadier general , USA ( May 15 , 1861 ) Major general , USA ( February 3 , 1865 ) USMA , 1825 Retired October 27 , 1863
Andrews , Christopher Columbus Brigadier general , USV ( January 5 , 1864 ) Major general , USV ( March 9 , 1865 )
Andrews , George Leonard Brigadier general , USV ( November 10 , 1862 ) Major general , USV ( March 26 , 1865 ) USMA , 1851 Resigned , 1855
Andrews , Timothy Patrick Colonel , USA ( September 6 , 1862 ) Brigadier general , USA ( September 13 , 1847 ) Paymaster General ( 1862-1864 ) Retired November 29 , 1864 Rejected a commission as brevet brigadier general , USA ( March 13 , 1865 ) on the basis that he already possessed such an appointment
Arnold , Lewis Golding Lieutenant colonel , USA ( August 1 , 1863 ) Brigadier general , USV ( January 24 , 1862 )  USMA , 1837 Retired February 8 , 1864
Arnold , Richard Captain , USA ( May 14 , 1861 ) Brigadier general , USV ( November 29 , 1862 ) Major general , USA ( March 13 , 1865 ) Major general , USV ( August 22 , 1865 ) USMA , 1850
Asboth , Alexander Sandor Brigadier general , USV ( March 21 , 1862 ) Major general , USV ( March 13 , 1865 ) Appointed brigadier general , USV ( September 3 , 1861 ) by John Charles Frémont who lacked the authority to make such an appointment United States Minister to Argentina and Uruguay ( 1866-1868 )
Augur , Christopher Columbus Lieutenant colonel , USA ( July 1 , 1863 ) Major general , USV ( August 9 , 1862 ) Major general , USA ( March 13 , 1865 ) USMA , 1843
Averell , William Woods Captain , USA ( July 17 , 1862 ) Brigadier general , USV ( September 26 , 1862 ) Major general , USA ( March 13 , 1865 ) Major general , USV ( August 7 , 1864 ) USMA , 1855
Ayres , Romeyn Beck Captain , USA ( May 14 , 1861 ) Brigadier general , USV ( November 29 , 1862 ) Major general , USA ( March 13 , 1865 ) Major general , USV ( August 1 , 1864 ) USMA , 1847