During the fourteenth century, Scotland, exhausted with the struggle for national independence, was unable to engage in extensive building. Beside, Bruce’s policy was opposed to castle building, as such edifices were liable to be captured by the enemy and a secure footing thereby obtained. His policy was rather to strip the country, and to destroy everything in front of an invading army, with a view to starving it out. The houses of the peasantry were made of wood and could easily be restored when destroyed. The houses of the nobility took the form of square towers on the Norman model and all castles of the fourteenth century were on this simple plan—a square or oblong tower with very thick walls and defended from a parapeted path round the top of the tower. The angles were rounded or projected on corbels in the form of round bartizans. At first these parapets were open and machicolated. As time went on, the simple keep was extended by adding on a small wing at one corner, which gave the ground plan of the whole building the shape of the letter =L=. The entrance was then placed as a rule at the re-entering angle. Such keeps are usually spoken of as built on the =L= plan. The ground floor was vaulted and used for stores or stables and as accommodation for servants. The only communication between this and the first floor was a hatch. In early castles the principal entrance was often on the floor above the ground floor and was reached by a stair easily removed in time of danger. Access from one storey to another was by a corkscrew or newel stair at one corner in the thick wall. Thus constructed a tower could resist siege and fire, and even if taken, could not be easily damaged. Of this kind of keep Aberdeenshire has many excellent examples, the most perfect, perhaps, being the Tower of Drum. It stands on a ridge overlooking the valley of the Dee. To the ancient keep built probably late in the thirteenth century was added a mansion-house on a different plan in 1619. The estate was granted to William de Irvine by Bruce in recognition of faithful service as secretary and armour-bearer. Previous to that, Drum was a royal forest and a hunting-seat of the king. The keep, which stands as solid and square to-day as it did six hundred years ago, is quadrilateral and the angles are rounded off. The entrance was at the level of the first floor. The main stair is a newel. In the lowest storey the walls are twelve feet thick, pierced with two narrow loops for light. In a recess is the well. On the top of the tower are battlements, the parapet resting on a corbel-table continued right round the building. Hallforest near Kintore is an example of a fourteenth century keep. It was built by Bruce as a hunting-seat and bestowed on Sir Robert de Keith, the Marischal. It still belongs to the Kintore family but is now a ruin.