From the New York Times, 9/6/1879
The burning down of the notorious military prison, popularly known as Castle Thunder, in Richmond, Va., the other day, removes another of the monuments of the civil war. It stood but a little distance from Libby Prison, and, like it, was originally a tobacco factory. A number of the Union officers were confined there on special charges, as were several of the war correspondents of the New York newspapers, who were held, so the rebels absurdly put it, as hostages for the good conduct of the Government. It was used generally, however, for the confinement of Southern citizens who had been suspected of the crime of Unionism, and of rebel officers who had been accused of violating military laws. Two or three Union men were hanged as spies in the inclosure of the prison, and many thrilling scenes of daring and escape were enacted there during the eventful four years of the bloody struggle. The prisoners were often brutally and cruelly treated, especially by Capt. ALEXANDER, of Baltimore, for some time keeper of the horrid den. Castle Thunder has a strange and romantic, as well as horrible history, which was never been half written, and which is not now likely to be. The old smoke-begrimed walls, still standing, have witnessed great suffering and the slow agony of many a poor soul.