This ability of the few to rule the many and force them to support their masters was increased as certain peoples learned better than others how to make strong armor and effective weapons. Nearly five hundred years before the time of Christ, at the battle of Marathon (Măr′ȧ thŏn), the Greeks discovered that one Greek, clad in metal armor and armed with a long spear, was worth ten Persians wearing leather and carrying a bow and arrows or a short sword. One hundred and sixty years later, a small army of well-equipped Macedonian Greeks, led by that wonderful general, Alexander the Great, defeated nearly forty times its number of Persians in a great battle in Asia and conquered a vast empire. [Illustration: Alexander Defeating the Persians] In later times, as better and better armor was made, the question of wealth entered in. The chief who had money enough to buy the best arms for his men could defeat his poorer neighbor and force him to pay money as to a ruler. Finally, in the so-called “Middle Ages,” before the invention of gunpowder, one knight, armed from crown to sole in steel, was worth in battle as much as one hundred poorly-armed farmers or “peasants” as they are called in Europe. In the “Dark Ages,”[2] after all these barbarians that we have named had swarmed over Europe, and before the governments of modern times were fully grown, there were hundreds of robber chiefs, who, scattered throughout a country, were in the habit of collecting tribute at the point of the sword from the peaceful peasants who lived near. This tribute they collected in some cases, regularly, a fixed amount each month or year, just as if they had a right to collect it, like a government tax collector. It might be money or food or fodder, or fuel. The robber chiefs were well armed themselves and were able to give good weapons and armor to their men, who lived either in the chief’s castle or in small houses built very near it. They likewise plundered any travelers who came by, unless their numbers and weapons made them look too dangerous to be attacked. But the regular tribute forced from the peaceful farmers was the chief source of their income. The robber chief and his men lived a life of idleness when they were not out upon some raid for plunder, and the honest, industrious peasants worked hard enough to support both their own families and those of the robbers. [2] The “Dark Ages” came before the “Middle Ages.” They were called “dark” because the barbarians had extinguished nearly all civilization and learning. [Illustration: A Knight in Armor]