The Wealth of Nations by Part 5 Chapter 1 Page 42

by militias have generally been, not over standing armies, but over other militias in exercise and discipline inferior to themselves. Such were the victories which the Greek militia gained over that of the Persian empire; and such too were those which in later times the Swiss militia gained over that of the Austrians and Burgundians.

The military force of the German and Scythian nations who established themselves upon the ruins of the western empire continued for some time to be of the same kind in their new settlements as it had been in their original country. It was a militia of shepherds and husbandmen, which, in time of war, took the field under the command of the same chieftains whom it was accustomed to obey in peace. It was, therefore, tolerably well exercised, and tolerably well disciplined.