The fire which had been kindled in the back office, spread rapidly to the upper part of the house, the flames in a little time communicating to the three houses on the north side, which were of equal size with the one occupied by the Provost-Marshal. Around the bell-tower in Fifty-first street, the mob had sent their friends to stop the bell from ringing. When engine Number Thirty-three, and Hose Fifty-three were coming down Third avenue, they were cheered by the mob, but not allowed to work. The corner building having been nearly destroyed, one of the engineers now mounted the engine and appealed to the crowd for permission to throw water upon the fire, telling them that they had accomplished their purpose in burning the Marshal’s office. About one o’clock Chief-Engineer Decker arrived at the scene of conflagration, and seeing how matters stood, he ordered the firemen to go to work and extinguish the flames, and thus prevented the conflagration from extending to the neighboring buildings. But a great deal of damage had already been done; and not less than six families were turned houseless into the streets. Shortly after eleven o’clock a detachment of the Provost Guard, numbering fifteen and a half files, belonging to the Invalid Corps, left the Park Barracks and reached the ground about noon. Upon reaching Thirty-fourth street, the mob began to surround them, hooting, yelling, and groaning. The guard formed in line between Forty-fourth and Forty-fifth streets, but were so closely pressed upon all sides, that they were unable to “order arms.” The mob now commenced pushing and jolting the soldiers, and throwing stones at them, when Lieutenant Reed, who was in command of the guard, ordered his men to load, and immediately after gave the order to “fire.” The soldiers poured a blank volley into the crowd, and no one was hurt. The crowd, who had retreated a short distance when the firing occurred, quickly rallied, and closing upon the guard, wrested arms from their hands, and discharged several of the pieces which had been reloaded. The soldiers, thus attacked, retreated quickly, but were pursued by the infuriated throng. The pursuit was kept up as far as Twentieth street, when it was abandoned, and a majority of the men escaped. One of the soldiers was pursued up Forty-first street to First avenue, where a crowd of some twenty men surrounded him, knocked him down, and beat him until he was insensible. A number of women joined in, and one of them endeavored to stab him with a bayonet, but another woman took the weapon out of her hand, and carried it off. The soldier was left dead on the walk. It was impossible to tell whence the first steps of this movement proceeded; for in twenty or thirty different places men ceased labor as if at some mysterious signal, and poured pell-mell into the streets to join the rioters.