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CARDIFF CASTLE. (12th Century)
CAERPHILLY CASTLE. (13th Century)

Caerphilly is described by the latest historian of the Art of War as the grandest specimen of its class; it represents the high-water mark of mediæval military architecture in this country, and was the model of Edward I.’s great castles in the north. It illustrates the influence of the Crusades on Western Europe, being an instance of the “concentric” system of defences, of which the walls of Constantinople afford the most magnificent example, and which the Crusaders adopted in many of their great fortresses in the East.

Caerphilly Castle consists of three lines of defences, and the way in which these supplement each other shows that the work in all essentials was designed as a great whole; it did not grow up bit by bit. There are of course many evidences of alterations and rebuilding at later times; the buildings in the middle ward, on the south side, seem to be later additions; the hall appears to have been enlarged, and the tracery of the windows suggests the fourteenth century; the state-rooms to the west of the hall have been much altered; but such alterations as appear are confined to the habitable part of the castle, and do not affect it as a military work. It has been suggested that the castle may have been greatly enlarged in the latter years of Edward II., when it played an important part in connection with the division of the Gloucester inheritance and the younger Despenser’s ambitions. There are a number of notices of the castle in the chronicles and public records of that time, but apparently no references to any building operations. And the unity of plan is evidence that the whole dated from the same time.

The castle is built on a tongue of gravel nearly surrounded by low, marshy land, forming a sort of peninsula; a stream on the south running eastwards to the Rhymny; and two springs on the north. By damming these waters and cutting through the tongue of gravel an artificial island was secured for the site of the castle. The inner ward, or central part of the castle, consists of a quadrangle with a large round tower at each corner: in the centre of the east and west side are massive gate-houses defended by portcullises; from the projecting corner towers all the intervening wall was commanded. The gateways communicate with the second line of defence or middle ward. This completely encircles the inner ward, on a much lower level; it is a narrow space bounded by a wall, with low, semi-circular bastions at the corners; it is commanded at every point from the inner ward; the narrowness of the space would prevent the concentration of large bodies of assailants or the use of battering-rams, and communication is at several points stopped by walls or buildings jutting out from the inner ward. The middle ward had strong gate-houses at the east and west ends, and was completely surrounded by water—east and west by a moat, north and south the moat widens into lakes: note how on the north a narrow ridge of gravel has been used to ensure a water moat on that side, in case there was not enough water to flood the whole lake. These lakes form part of the third line of defence or outer ward, which includes also on the west the “horn-work” and on the east the grand front. The horn-work is about three acres in extent, surrounded by a wall 15 feet high, which is of the nature of an escarpment, the ground rising above it. It is entirely surrounded by a moat, and connected with the middle ward on one side and the mainland on the other by drawbridges. It would probably be used for grazing purposes, and thus would be of great value to the garrison; but so far as the actual defences of the castle are concerned, a lake would have been much more effective; the nature of the ground would however have prevented this. The horn-work was intended to cover the only side upon which the castle was open to an attack from level ground, and to occupy what would otherwise have been a dangerous platform.

The eastern side of the outer ward—the grand front—is a most imposing structure. It is a wall about 250 yards long, and in some parts 60 feet high, furnished with buttresses and projecting towers from which the intervening spaces are easily commanded, culminating in the great gate-house near the centre, and terminating at both ends in clusters of towers which protect the sally-ports. On the outside is a moat spanned by a double drawbridge. The northern part of this front, which was probably occupied by stables, would in dry weather be the least defensible part of the castle; but it was cut off from the rest by an embattled wall running from the gate-house to the inner moat and pierced only by one small and portcullised gate. The southern half was more important and stronger. It crossed the stream at the dam, the walls being 15 feet thick where subjected to the pressure of the water, and the strong group of towers at the end—on the other side of the stream—guarded the dam on which the safety of the castle largely depended; the wall and towers here form a semicircle, curving back into the edge of the lake, so as to avoid the danger of being outflanked.

On the inside of the grand front were various buildings, such as the mill. This eastern line was divided from the middle ward by a moat 45 feet wide—a space which is too wide to be spanned by a single drawbridge, and as there are no signs of the foundations of a central pier, it seems probable that the bridge rested on a wooden support, which could be removed when necessary, and the assailants plunged into the moat below.

There are a large number of interesting details connected with both the military functions of the castle and its domestic economy. There were at least four exits (not counting the two water-gates); this would give the garrison opportunities of harassing assailants by sallies, and would make a much larger army necessary in order to blockade the castle; contrast the single narrow entrance to the Norman keep—high up in the wall and visible to all outside. The water-gates are worth studying, especially the methods of protecting the eastern water-gate—two grates with a shoot above and between them. One should notice, too, the “splaying” of the outer wall, by which missiles from the top would be projected outwards; and also the use of the mill-stream to carry away the refuse of the garderobe tower. And there are many other points, to which one would like to call attention, if time allowed.