this interval appears strange at first sight; but Hippias was with them, and they and he were aware of their chance of a bloodless conquest through the machinations of his partizans among the Athenians. The nature of the ground also explains in many points the tactics of the opposite generals before the battle, as well as the operations of the troops during the engagement.
The plain of Marathon, which is about twenty-two miles distant from Athens, lies along the bay of the same name on the north-eastern coast of Attica. The plain is nearly in the form of a crescent, and about six miles in length. It is about two miles broad in the centre, where the space between the mountains and the sea is greatest, but it narrows towards either extremity, the mountains coming close down to the water at the horns of the bay. There is a valley trending inwards from the middle of the plain, and a ravine comes down to it to the southward. Elsewhere it is closely girt round on the land side by rugged limestone mountains, which are thickly studded with pines, olive-trees, and cedars, and overgrown with the myrtle, arbutus, and the other low odoriferous shrubs that everywhere perfume the Attic air. The level of the ground is now varied by the mound raised over those who fell in the battle, but it was an unbroken plain when