The Greek Phalanx Under Alexander

Under Alexander the phalanx consisted of an aggregate of eighteen thousand men, who were divided into six brigades of three thousand each.

Continuing Alexander the Great Wins Battle of Gaugamela,
our selection from Fifteen Decisive Battles of the World by Sir Edward S. Creasy published in 1851. The selection is presented in nine easy 5-minute installments. For works benefiting from the latest research see the “More information” section at the bottom of these pages.

Previously in Alexander the Great Wins Battle of Gaugamela.

Time: 331 BC
Place: East of Mosul, Iraq

The phalangite soldier was fully equipped in the defensive armor of the regular Greek infantry. And thus the phalanx presented a ponderous and bristling mass, which, as long as its order was kept compact, was sure to bear down all opposition. The defects of such an organization are obvious, and were proved in after-years, when the Macedonians were opposed to the Roman legions. But it is clear that under Alexander the phalanx was not the cumbrous, unwieldy body which it was at Cynoscephate and Pydna. His men were veterans; and he could obtain from them an accuracy of movement and steadiness of evolution such as probably the recruits of his father would only have floundered in attempting, and such as certainly were impracticable in the phalanx when handled by his successors, especially as under them it ceased to be a standing force and became only a militia.

Under Alexander the phalanx consisted of an aggregate of eighteen thousand men, who were divided into six brigades of three thousand each. These were again subdivided into regiments and companies; and the men were carefully trained to wheel, to face about, to take more ground, or to close up, as the emergencies of the battle required. Alexander also arrayed troops armed in a different manner in the intervals of the regiments of his phalangites, who could prevent their line from being pierced and their companies taken in flank, when the nature of the ground prevented a close formation, and who could be withdrawn when a favorable opportunity arrived for closing up the phalanx or any of its brigades for a charge, or when it was necessary to prepare to receive cavalry.

Besides the phalanx, Alexander had a considerable force of infantry who were called shield-bearers: they were not so heavily armed as the phalangites, or as was the case with the Greek regular infantry in general, but they were equipped for close fight as well as for skirmishing and were far superior to the ordinary irregular troops of Greek warfare. They were about six thousand strong. Besides these, he had several bodies of Greek regular infantry; and he had archers, slingers, and javelin-men, who fought also with broadsword and target, and who were principally supplied him by the highlanders of Illyria and Thracia.

The main strength of his cavalry consisted in two chosen regiments of cuirassiers, one Macedonian and one Thessalian, each of which was about fifteen hundred strong. They were provided with long lances and heavy swords, and horse as well as man was fully equipped with defensive armor. Other regiments of regular cavalry were less heavily armed, and there were several bodies of light-horsemen, whom Alexander’s conquests in Egypt and Syria had enabled him to mount superbly.

A little before the end of August, Alexander crossed the Euphrates at Thapsacus, a small corps of Persian cavalry under Mazaeus retiring before him. Alexander was too prudent to march down through the Mesopotamian deserts, continued to advance eastward with the intention of passing the Tigris, and then, if he was unable to find Darius and bring him to action, of marching southward on the left side of that river along the skirts of a mountainous district where his men would suffer less from heat and thirst, and where provisions would be more abundant.

Darius, finding that his adversary was not to be enticed into the march through Mesopotamia against his capital, determined to remain on the battle-ground, which he had chosen on the left of the Tigris; where, if his enemy met a defeat or a check, the destruction of the invaders would be certain with two such rivers as the Euphrates and the Tigris in their rear.

The Persian King availed himself to the utmost of every advantage in his power. He caused a large space of ground to be carefully levelled for the operation of his scythe-armed chariots; and he deposited his military stores in the strong town of Arbela, about twenty miles in his rear. The rhetoricians of after-ages have loved to describe Darius Codomanus as a second Xerxes in ostentation and imbecility; but a fair examination of his generalship in this his last campaign shows that he was worthy of bearing the same name as his great predecessor, the royal son of Hystaspes.

On learning that Darius was with a large army on the left of the Tigris, Alexander hurried forward and crossed that river without opposition. He was at first unable to procure any certain intelligence of the precise position of the enemy, and after giving his army a short interval of rest he marched for four days down the left bank of the river.

A moralist may pause upon the fact that Alexander must in this march have passed within a few miles of the ruins of Nineveh, the great city of the primeval conquerors of the human race. Neither the Macedonian King nor any of his followers knew what those vast mounds had once been. They had already sunk into utter destruction; and it is only within the last few years that the intellectual energy of one of our own countrymen has rescued Nineveh from its long centuries of oblivion.

On the fourth day of Alexander’s southward march, his advance guard reported that a body of the enemy’s cavalry was in sight. He instantly formed his army in order for battle and directing them to advance steadily he rode forward at the head of some squadrons of cavalry and charged the Persian horse, whom he found before him. This was a mere reconnoitering party, and they broke and fled immediately; but the Macedonians made some prisoners, and from them Alexander found that Darius was posted only a few miles off and learned the strength of the army that he had with him. On receiving this news Alexander halted, and gave his men repose for four days, so that they should go into action fresh and vigorous. He also fortified his camp and deposited in it all his military stores and all his sick and disabled soldiers, intending to advance upon the enemy with the serviceable part of his army perfectly unencumbered.

More information here and here, and below.