The Wealth of Nations by Part 5 Chapter 1 Page 32

every respect a match for that standing army of which the valour appeared, in the last war, at least not inferior to that of the hardiest veterans of France and Spain.

This distinction being well understood, the history of all ages, it will be found, bears testimony to the irresistible superiority which a well-regulated standing army has over a militia.

One of the first standing armies of which we have any distinct account, in any well authenticated history, is that of Philip of Macedon. His frequent wars with the Thracians, Illyrians, Thessalians, and some of the Greek cities in the neighbourhood of Macedon, gradually formed his troops, which in the beginning were probably militia, to the exact discipline of a standing army.

When he was at peace, which