For two or three hours previous to the entrance of the stable, the police-officers were on the spot, making their observations, but still no suspicion was excited of the real object of their attack; and so well was the plan of surprise laid, that, until the discharge of fire-arms was heard, every thing remained perfectly quiet. Thus accurately informed of the intentions of the conspirators, warrants were issued to apprehend them while they were assembled. These warrants were put into the hands of the police-officers, under the able direction of Richard Birnie, Esq., the chief magistrate of Bow-street. A detachment of the Coldstream Guards from Portman-street barracks, were also ordered to accompany the police-officers. They proceeded to the place of meeting in Cato-street, the police-officers proceeding first. The conspirators had taken the precaution to place a sentinel below. The military consisted of the picket-guard of the 2d Coldstream Regiment, which was stationed in Portman-street barracks. It consisted of thirty men, including a sergeant and corporal, and commanded by Captain Frederick Fitzclarence, who happened to be on duty at the time. They were called out about a quarter to eight o’clock; each man provided with twenty rounds of ball cartridge. The detachment immediately proceeded in the direction of the Edgware-road. The men were not acquainted with the business on which they were called out. They supposed a fire had taken place, and that they had been sent for to protect the property. On their arrival within about sixty yards of the house in Cato-street, John-street, the place of the meeting, they were halted for a few minutes, during which they were ordered by Captain Fitzclarence to fix bayonets and shoulder arms. They were also enjoined to observe the strictest silence. The detachment then marched on, but had not proceeded more than a few yards when they heard the noise of fire-arms. They were then ordered to advance in double quick time, and instantly came in junction with the civil officers, who had arrived previously on the ground, and were engaged with the party in the house. The only approach to this pandemonium was by a narrow ladder. Ruthven, one of the principal Bow-street officers, led the way, and he was followed by Ellis, Smithers, Surman, and others of the patrol. On the door being opened, about twenty-seven or thirty men were seen within, all armed in some way or other; and some of them engaged either in charging fire-arms, or in girding themselves in belts similar to those worn by the military, while others were in close and earnest deliberation. There were tables about the room, on which lay a number of cutlasses, bayonets, pistols, sword-belts, pistol-balls in great quantities, ball-cartridges, _&c._