one o'clock before
The program had worked exactly as Brown had predicted . Not a shot had been fired and they were masters of the town , its two bridges , the United States Arsenal , Armory and Rifle Works . The men were now despatched through the town for the real work of the night -- the arming of the black legion with pikes and torches . It was one o'clock before the first accident happened . Patrick Higgins , the second night watchman , came to relieve Williams on the Maryland bridge . Oliver Brown , on guard , cried : `` You 're my prisoner , sir . '' The Irishman grinned .