As a theatre of war South Africa had one advantage, that it was for the most part eminently healthy. Enteric fever, the scourge of armies, was bound to be prevalent amongst thousands exposed to hardships in a country where the water supply was indifferent, where sanitation was usually primitive amongst the inhabitants, and impossible to improvise hurriedly. But the purity of the air, the geniality of the temperature, the cool nights, the brilliant sunshine, and the hard dry soil were palliatives of evils inseparable from all campaigning. Otherwise, for regular armies of invasion, South Africa was unfavourable. The railways were so few that the business of supply and movement was always arduous; spaces so vast that large forces were swallowed up; the enormous distances from one strategical point to another, intensified, in difficulty by the almost entire absence of good roads, the scarcity of substantial bridges, of well-built towns, of commodious harbours, and of even such ordinary necessaries as flour or fuel, all these complicated every military problem to a degree not readily intelligible to the student of European warfare alone. [Sidenote: The central plateau.] It is not easy to sum up briefly the typical qualities as a fighting area of a region so vast and diversified as South Africa; but its dominant feature is undoubtedly the great central plateau comprising southern Rhodesia, all the Transvaal, except a narrow fringe on the eastward, the Bechuanaland Protectorate, the Orange Free State, and the northern and central portions of Cape Colony. Westward this tableland slopes gradually and imperceptibly to sea level; to the south it reaches the Atlantic in the series of terraces and escarpments already described. Eastward it is shut in by the Drakensberg, whose spurs, projecting to the Indian Ocean, traverse at right angles Natal, Zululand, Swaziland, and Portuguese East Africa. [Sidenote: Effect on operations of plateau.] Upon the central South African plateau tactical and strategical success is dependent upon rapid manoeuvring. Positions are so readily turned that they can seldom be resolutely held. It is difficult, therefore, to bring an evasive enemy to decisive action, and the fruits of victory must chiefly be plucked by pursuit. The horse is as important as the man, and the infantry arm is reduced to the position of a first reserve, or to the _rôle_ of piquets on the lines of communication, which remain always open to attack. Superior numbers and, above all, superior speed, are irresistible. There are no first-class physical obstacles; the rivers, excepting only the Orange and the Vaal, are, as a rule, fordable; the hill features for the most part insignificant or easy to mask. Mobility is thus at once the chief enemy and aid to military success. [Sidenote: and of lower spurs.]