.... His crime was aiding the escape of one Boyle, of the New-York Mounted Rifles, from Fort Magruder, who was under sentence of death; also giving the said Boyle information of a proposed movement of Colonel Spears on Richmond, which he carried to the rebels and frustrated the design. In a short time the drums beat, and the men marched to an open space on the outside of the Fort, formed in two lines about o...