8. After a long preparation, in 490 B.C., an army of one hundred thousand men or more, under the command of Artaphernes, convoyed by a formidable fleet, invaded Greece. For a long time it met with little opposition, and city after city submitted to the overwhelming hosts of the Persian king. The approach to Athens was regarded as the final turning point of the war. 9. Artaphernes selected the Plains of Marathon, twenty-two miles to the northeast of Athens, as the place of his final landing. His forces, by the lowest estimate, consisted of one hundred and fifty thousand men, of which ten thousand were cavalry. To these were opposed the army of Athens and its allies, consisting in all of ten thousand men. The battle-ground forms an irregular crescent, six miles long and two broad in its widest part. It is bounded on one side by the sea, and on the other by a rampart of mountains. At the time of the battle the extremities of the plain were flanked by swamps, diminishing the extent of the front, and hampering the operations of the larger army. The command of the Greek army had been intrusted to ten generals, who ruled successively one day each. Themistocles, one of these generals, resigned his day in favor of Miltiades, and all the others followed his example. And so the battle was set, ten thousand Greeks, under Miltiades, against the overwhelming hosts of the enemy. 10. The Persians, confident in their numbers, erected no intrenchments. They did not dream of an attack from the little band of Greeks. There is evidence to believe that they were dissatisfied with the nature of the battle-field they had chosen, and were upon the point of embarking to land at some point nearer the city. If this was the case, they were very rudely awakened from their dream of security by the movement of the Greeks. 11. On the morning of the tenth day after leaving Athens, Miltiades drew up his army in order of battle. He was obliged to perilously weaken his center in order to confront the whole of the Persian army, so as to avoid the danger of being outflanked and surrounded. The Greeks began the battle by a furious attack along the whole line, endeavoring to close in a hand-to-hand conflict as soon as possible, so as to avoid the deadly arrows of the Persians, and to take the advantage of their heavier arms. The Persians were greatly astonished when they saw this little band rushing against them with such a headlong dash, and thought that the Greeks must have been seized with madness. The Persian general had concentrated his forces at the center, and at this part of the battle-field the fiery onset of Greeks was checked by mere weight of numbers. But at length the mighty Persian force moved irresistibly forward, forcing the Greeks slowly backward, fighting, dying, but never yielding. Soon the Greek army were cut in two, and the Persians marched proudly onward to assured victory.