The men were at once set to work to destroy a bridge across a torrent at the mouth of a defile. It was built of stone, but was old and in bad repair, and the men had little difficulty in prising the stones of the side walls from their places, and throwing them down into the stream. Another party made a hole over the key of an arch. A barrel of powder was placed here, and a train having been laid, was covered up by a pile of rocks. A third party formed a barricade six feet high, across the end of the bridge, and also two breastworks, each fifty yards away on either side, so as to flank the approaches to the other end and the bridge. The troops were extended along the hillsides, one battalion on each side of the defile, under the shelter of the rocks and brush.

While these preparations were being made, the horses were taken up to the top of the hills by some paths known to the peasants of a little village near the mouth of the defile, the women and children following them. Terence and Herrara had a consultation, and then the former called Bull and Macwitty to him.