The drawbridge fell into the moat, plunging all those upon it into the water.
Archie, with his band, after detaching some of their number to fire the homesteads, had crept up unperceived in the darkness to the end of the drawbridge, and had noiselessly cut the two projecting beams upon which its end rested when it was lowered.

He had intended to carry out this plan on the previous night, but when darkness set in not a breath of wind was stirring, and the night was so still that he deemed that the operation of sawing through the beams could not be effected without attracting the attention of the warders on the wall, and had therefore retreated far up in the recesses of the hills.

The next night, however, was windy, and well suited to his purpose, and the work had been carried out without attracting the attention of the warders.

When Kerr and his men-at-arms rode out, the whole weight of the drawbridge and of the horsemen crossing it was thrown entirely upon the chains, and these yielded to a strain far greater than they were calculated to support.
The instant the men-at-arms were precipitated into the moat, Archie and his companions, who had been lying down near its edge, leapt to their feet, and opened fire with their bows and arrows upon them.
It was well for Sir John and his retainers that they had not stopped to buckle on their defensive armour.

Had they done so every man must have been drowned in the deep waters.