promoted to Full Major on 28 Feb 1864, promoted to Full Lieutenant Colonel (Not Mustered) on 28 July 1864, and mustered Out Company D, 19th Infantry Regiment Massachusetts on 19 July 1865. Post-war congressional testimony Dunn saw General John H. Winder inspect the Columbia, South Carolina prison camp in which Dunn was held. Dunn testified before the Congressional Committee of the House of Representatives for the Treatment of Prisoners of War and Union Citizens that Winder and other high officers were well aware of the starvation rations and harsh conditions. Dunn also described to the committee the Confederates' use of bloodhounds to track down escaped Union Army prisoners. Final years and family Dunn worked as a customs house clerk after the war and died of heart disease in Massachusetts in 1895. He was a brother of Wallace Dunn (1827–1907) and uncle of inventor Moncena Dunn. References 1822 births 1895 deaths People from Poland, Maine Union Army officers