The Wealth of Nations by Part 5 Chapter 1 Page 25

which the soldiers had, each individually, the greatest skill and dexterity in the use of their arms. Strength and agility of body were of the highest consequence, and commonly determined the state of battles. But this skill and dexterity in the use of their arms could be acquired only, in the same manner as fencing is at present, by practising, not in great bodies, but each man separately, in a particular school, under a particular master, or with his own particular equals and companions.

Since the invention of firearms, strength and agility of body, or even extraordinary dexterity and skill in the use of arms, though they are far from being of no consequence, are, however, of less consequence. The nature of the weapon, though it by no means puts the awkward upon a level with the skilful, puts him more nearly so than he