Nearly two thousand years ago there was a brave captain whose name was Julius Caesar. The soldiers he led to battle were very strong, and conquered the people wherever they went. They had no gun or gunpowder then; but they had swords and spears, and, to prevent themselves from being hurt, they had helmets or brazen caps on their heads, with long tufts of horse-hair upon them, by way of ornament, and breast-plates of brass on their breasts, and on their arms they carried a sort of screen, made of strong leather.