"We skirted the eastern face of the fort," began Sergeant True, "and reached Lake Katrine. Then we saw that the fort is built some distance from the water on the crown of the hill that forms the shore, which there slopes down to the lake. The defences on the water front are like those on the other side, but not so heavy. The tower at the angle is different, however. It has been built by the Wolf Legion, and Captain Arenicola is in command. It is a pentagon or five-sided turret of dry twigs, like a log chimney, and is silk-lined within.[N] The Pixies' skull-and-bones flag floats from the top. "Here we held a consultation and agreed to divide our party. Sergeant Clearview with Corporal Dare and three men undertook to survey the river front. It fell to myself to explore the interior of the fort, aided by Corporal Swiftsure and two men, Lookclose and Treadlight. Having bidden good-bye to our companions, I explained to my men the delicate and dangerous work in which we were engaged. Then we divided our squad into two parties. I took Treadlight and pushed forward, having bidden Swiftsure and Lookclose to follow at a distance that would leave us just in view. In case of discovery or accident to either party, the first duty of the other was to escape and tell at headquarters the facts already learned. "The fort is so newly built that the surface is not yet thickly covered with snares, traps and crosslines. This greatly favored us. We found the chief part of the fort to be an immense Tubeweaver's tent built by Engineer Agalena. The central tube runs downward toward the Lake, and opens out near a tower that guards the water front. The tent is built around tall weeds which stick out like the poles of a circus pavilion, and from their tips strong guy lines stretch to various points on the roof, thus bracing it up.[O] "We skirted the vast edifice as far as the central front gate, just opposite to which we found another of Arenicola's turrets. From this point, sweeping around toward the Lake, and fronting the tower on the southwest angle, is erected a strong tent of the Tegenaria type. It is composed of a thick sheet like that of Agalena, but this is drawn up at the margin, making a sort of breastwork. Along the pouch-like depression within are many sentinels for whom openings are pierced in the breastwork. The system ends in a tall round tower, in which Captain Tegenaria has his observatory.[P] "We wished to cross the path between the front Linyphia gate and the opposite tower, but it was so thronged by passing Pixies that we dare not venture. We therefore turned back, thinking we had discovered enough, and ought not to further risk losing what we had learned." "A wise and patriotic decision," said Captain Bruce, "but how did you get out of the Pixie quarters?" [Illustration: FIG. 20.--Arenicolas' Tower and Stridulans' Drum.]