Rank and organization: First Lieutenant, Company A, 1st New York Cavalry.
Place and date: At Chancellorsville, Va., 2 May 1863.
Entered service at:
New York, N.Y.
Date of issue: 27 November 1896.
Volunteered to ascertain the character of approaching troops; rode up so
closely as to distinguish the features of the enemy, and as he wheeled
to return they opened fire with musketry, the Union troops returning same.
Under a terrific fire from both sides Lieutenant Thomson rode back unhurt
to the Federal lines, averting a disaster to the Army by his heroic act.
This data was extracted from the Committee on Veterans' Affairs, U.S. Senate, Medal of Honor Recipients: 1863-1973 (Washington, D.C.: Government Printing Office, 1973)