[LINCOLN -- ASSASSINATION]. CORBETT, Thomas P. "Boston," Sergeant, Company "L", 16th New York Cavalry. Signature ("Boston Corbett"), on small card, approx. 109 x 65 mm. On the morning of 26 April 1865, Corbett was at the Garrett farm where Booth and Herold had concealed themselves in the barn. The troops were told to hold their fire and orders given to burn the barn. Corbett shot Booth (through a chink in the boards, by some accounts), claiming he had had a "vision." Originally arrested, since Stanton had wanted Booth captured alive, Corbett was publicly acclaimed a hero and quickly released. Several years later he was judged insane, probably from mercury poisoning, and committed to an institution.