From the two gate towers, right and left, there extends a considerable stretch of sheer wall terminating at either extremity with two more towers which mark the corners on the landward side of the fortress. These four towers, of course, by projecting far beyond this curtain wall, are posted so as to permit a steady fire of missiles on any enemy who may somehow ensconce himself close under the wall. The two sections of curtain wall themselves are some dozen feet thick, with a firm walk along their summit, protected by a stone parapet. To enable the defenders, however, to drop stones and other forms of destruction upon attackers who may be under the very base of the wall and defying the bolts from the towers, a structure of heavy timbers can be built out all along the wall overhanging the moat. These wooden hordings are strong enough to withstand many stones from the casting engines, but they can sometimes be set on fire. In a siege, therefore, they will be covered with raw hides. The same will also be put over the conical wooden roofs which cap the towers. Since this is a time of peace, however, the hordings stand weather-stained and bare. To cover the entire woodwork with hides will be one of the first tasks of the garrison in case of a serious alarm. As we survey the outer walls of the castle, it is clear that no enemy will try to batter down the towers. Even if he could penetrate their shells, he would merely find himself in a dark, cavernous, vaulted chamber, with the defenders flinging down death from above. He would then have to bore through the inner wall, nearest the court, under every disadvantage. The towers are built so completely of masonry that it is impossible to burn them. Winding stairs, leading up through the stonework, conduct from one stage to another; and these staircases are so narrow and tortuous that a single warrior with an ordinarily lively ax can stop a hundred men ascending.[5] The attack, therefore, must be on the curtain walls. But even here, supposing one has scaled the battlements, more troubles are awaiting. The only way downward from the curtain walls is through the towers at the end of the parapets. To leap into the court inside means broken bones. The gangways along the parapet are intercepted at several points by wooden bridges. These can be easily knocked away, leaving yawning gaps defying any leaper. If you reach the towers they are all barred, and the arbalists are shooting down on the captured gangways from a dozen loopholes. Finally, be it said, each tower is a little fortress by itself. It has its own cistern, fireplace for cooking, and storeroom. Even if isolated, its garrison can hold out stoutly. So much for the task of attacking merely the outer ward of St. Aliquis. [Illustration: VIEW OF THE COURT AND THE DONJON] [Sidenote: Inner Court and Donjon]