Some of Brown's men had escaped, however, from the place, in the course of the skirmish, and Cook had not been noticed at all in the fray or in the town since an early hour on Monday morning, when he was seen to cross the Potomac on the bridge into Maryland with a few others, taking with him two horses and a wagon captured at Colonel Washington's place on the previous night, and two or three slaves belonging to that gentleman. There was satisfactory evidence, however, of his being fully implicated in the outrage and it was ascertained that he, Owen Brown--one of old John's sons--and others had been detailed to operate on the Maryland shore and that they had seized a schoolhouse, taken the Domine--McCurrie--prisoner and driven away the pupils, for the purpose of establishing at the place a depot for arms convenient to Harper's Ferry. It was learned, also, that all the day of the 17th, they had kept up a musketry fire from the Maryland mountain on the people of the town, and that late in the evening Cook had got supper at the canal lockhouse, on the Maryland side of the river. Moreover, it was supposed that, finding the fate of war against them, they had fled towards Pennsylvania. A large body of men, under Captain Edmund H. Chambers, an old citizen and a man of well known courage, marched towards the Schoolhouse and the Kennedy farm and, at each place they found a large number of Sharp's rifles, pistols, swords, &c., with a corresponding quantity of powder, percussion caps and equipments of various kinds. A swivel cannon carrying a one pound ball was discovered, also, in a position to command the town, although it is not known that it was used during the skirmish. A large number of pikes of a peculiar form, and intended for the hands of the negroes, was also found. The blacks were expected to turn out at the first signal, and this weapon was considered to be better suited to them than firearms, especially at the commencement of the campaign. It should have been mentioned before that Brown had put into the hands of his negro prisoners some of these pikes, but, up to the time of the discovery of the magazine at the Kennedy farm, the object of this novel weapon was not fully understood. Captain Chambers' party found, also, a great number of papers which tended to throw light on the conspiracy and several hundred copies of a form of provisional government to be set up by Brown as soon as he had got a footing in the south.