their tents on the heights, and form in order of battle on the plain.
There was deep need of skill, as well as of valour on Alexander's side; and few battle-fields have witnessed more consummate generalship than was now displayed by the Macedonian King. There were no natural barriers by which he could protect his flanks; and not only was he certain to be overlapped on either wing by the vast lines of the Persian army, but there was imminent risk of their circling round him and charging him in the rear, while he advanced against their centre. He formed, therefore, a second or reserve line, which was to wheel round, if required, or to detach troops to either flank, as the enemy's movements might necessitate; and thus, with their whole army ready at any moment to be thrown into one vast hollow square, the Macedonians advanced in two lines against the enemy, Alexander himself leading on the right wing, and the renowned phalanx forming the centre, while Parmenio commanded on the left.
Such was the general nature of the disposition which Alexander made of his army. But we have in Arrian the details of the position of each brigade and regiment; and as we know that these details were taken from the journals of Macedonian generals, it is interesting to examine them, and