It is probable that the Persian generals reckoned rather on the latter alternative. At this time the balance of military prestige was greatly on their side. The conquerors of a continent were face to face with the army of a canton, and were, moreover, superior in numbers to the enemy. They may well have expected that the Greek would not dare to fight, or, if he did fight, would be badly beaten. The successes gained against them by the Ionians had not been on land; and they doubtless judged of the trained hoplite of European Greece in the light of their experience of the imperfectly trained Ionian hoplite they had recently had encountered in Asia. It is now possible to conjecture the reasons which had induced them to re-embark their cavalry. The circumstances of transport forbid the supposition that they were numerically very strong in this arm. Had they left it at Marathon, it would not have been of service in pursuing the Greeks along the rugged upper road. Even had it been sent round by the lower road, its strength cannot have been such as to render it a formidable obstacle to a strong unbeaten army making straight for its goal at Athens. But on board the fleet, cavalry might be of immense value for a dash on the capital immediately on the arrival at Phaleron. There every minute would be of importance; and, furthermore, in the open Athenian plain, it would be able to get round opposition, if unable to sweep it aside. #THE BATTLE ARRAY.# There is no evidence on the subject; but it is almost inconceivable that the lower road was not watched and guarded by some body of Athenian troops; and, though the road itself is easy, there are, even at the present day, places in the great tract of woodland through which it passes which an unsupported body of cavalry would find very difficult to force in face of opposition. [Illustration: MARATHON FROM THE “SOROS.” 1. Valley of Vrana, or Avlona. [_To face page_ 187. ] The situation of the Athenian army was more simple, in that the council of war had already provided for it. There was, indeed, as Miltiades had foreseen, no alternative but to attack. An attempted retreat along the rugged upper road, harassed by an enemy superior in numbers and lighter in equipment, might end in disaster, and must end in the army arriving at Athens too late to meet the force which was going round by sea. Thus the battle was inevitable. It must have been on the plain immediately off the entrance of the valley of Avlona that the Athenians formed their battle array. ◆H. vi. 111.◆