The impression of the district is most clearly conveyed from some sandy summit, bare of trees, whence a man may overlook, though not from any great height, the desolate landscape for some miles. He obtains from such a view neither the sense of forest which wooded lands of great height convey in spite of their clearings, nor the sense of endless plain which he would find farther to the east or to the north. He perceives through the singularly clear air in autumn brown heaths and plains set here and there with the great stretches of woodland and farmsteads, the stubble of which is soon confused by the eye in the distance with the barren heaths around. In winter, the undulating mass of deep and even snow is marked everywhere by the small, brown, leafless trees in their great groupings, and by the pines, as small, and weighted with the burden of the weather; but much the most striking of the things seen in such a landscape are the stretches of black water, or, if the season be hard, of black ice which, save when the snow has recently fallen, fierce winds will commonly have swept bare. The military character of such a region will be clear. It is, in the technical language of military art, a labyrinth of _defiles_. Care has been expended upon the province, especially in the last two generations, and each narrow passage between the principal sheets of water carries a road, often a hard causeway. A considerable system of railways takes advantage of the same natural narrow issues; but even to those familiar with the country, the complexity of these narrow dry gates or defiles, and their comparative rarity (contrasted with the vast extent of waterlogged soil or of open pool), render an advance against any opposition perilous, and even an unopposed advance slow, and dependent upon very careful Staff work. Columns in their progress are for hours out of touch one with the other, and an unexpected check in some one narrow must be met by the force there present alone, for it will not be able to obtain immediate reinforcement.