It was discovered that there was a natural subterranean passage from the grove of Judge Roscoe's place to a cellar, a portion of which had constituted the powder magazine on the Devrett hill, and that this had been exploded by means of a slow match through the grotto, previously prepared, enabling the raiders to effect their escape. It was further ascertained that Julius Roscoe, who had led the enterprise, had been in hiding for some time at his father's home, and had been seen as he issued thence covered with blood, evidently fresh from some personal altercation with a Federal officer, for weeks a guest in the house. Although bruised and bleeding, this officer could offer no account of his wounds save a fall, impossible to have produced them; he had raised no alarm, and had given no report of the presence of an enemy, whose intrusion had wrought such damage and disaster to the Union cause. One detail led to another, each discovery unveiled cognate mysteries, the disclosure of trifles brought forward circumstances of importance. The claim of the sentinel posted at Judge Roscoe's portico that he had fired the first shot which raised the alarm, evoked the fact that an earlier sentry had told Captain Baynell that he had heard marching feet--a moving column in the cadenced step, he described it now--near, very near, that murky night, and that Captain Baynell had waived it away with the suggestion of "a corporal of the guard with the relief"--at that hour!--when the next relief would not be due till nearly midnight,--and had gone back into the parlor, where Mrs. Gwynn had begun to sing, "Her bright smile haunts me still."