In a community of hunters or of shepherds, every man easily and necessarily becomes a soldier. His ordinary avocations are perfectly compatible with all the duties of military service. However remote may be the expedition on which he is bound, he finds it easy to transport with him the stock from which he derives his subsistence. The whole people is an army; the whole year a march. Such was the state of society which facilitated the gigantic conquests of Attila and Tamerlane. But a people which subsists by the cultivation of the earth is in a very different situation. The husbandman is bound to the soil on which he labours. A long campaign would be ruinous to him. Still his pursuits are such as give to his frame both the active and the passive strength necessary to a soldier. Nor do they, at least in the infancy of agricultural science, demand his uninterrupted attention. At particular times of the year he is almost wholly unemployed, and can, without injury to himself, afford the time necessary for a short expedition. Thus the legions of Rome were supplied during its earlier wars. The season during which the fields did not require the presence of the cultivators sufficed for a short inroad and a battle. These operations, too frequently interrupted to produce decisive results, yet served to keep up among the people a degree of discipline and courage which rendered them, not only secure, but formidable. The archers and billmen of the middle ages, who, with provisions for forty days at their backs, left the fields for the camp, were troops of the same description. But when commerce and manufactures begin to flourish a great change takes place. The sedentary habits of the desk and the loom render the exertions and hardships of war insupportable. The business of traders and artisans requires their constant presence and attention. In such a community there is little superfluous time; but there is generally much superfluous money. Some members of the society are, therefore, hired to relieve the rest from a task inconsistent with their habits and engagements.