Alexander agreed. He ordered camp to be set up again, then spent the day inspecting both the field of battle, which had been leveled to accommodate Darius’ cavalry and chariots, and the arrangement of the Persian forces. The left and right wings of Darius’ line were predominantly cavalry, intermingled with archers and infantry. In the center, and protecting Darius to their rear, were his special Greek mercenary cavalry and his royal foot and horse guards, sometimes called “apple-carriers” because of the golden apples on their spear butts. In addition, Darius had amassed an infantry contingent of mixed nationality who, it has been surmised, were most probably untrained men hurriedly summoned from the hills. They increased Darius’ head count, but it remained to be seen what they would contribute to their king’s defense. The entire Persian line was fronted by some 200 scythe chariots, so named because of the sickle-like knives protruding from their wheels. A small number of Asian elephants loomed over the Persian host.

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The total numbers of the Persian army have been estimated by historians at anywhere from 200,000 to an implausible one million. For Alexander, precise numbers made little difference. Even at the most conservative estimate, he was grossly outnumbered. His battle plan would have to be brilliant. He spent most of that night not in slumber, but in forging that plan. The most critical factor was that Alexander’s cavalry, the fighting force so important to him that numbered approximately 7,000, faced about 34,000 Persian cavalry. Rather than being daunted by such odds, Alexander mapped out a strategy destined to be emulated by later generals such as Napoleon Bonaparte.

At one point in the wee hours General Parmenion came to him, proposing a night attack on the unsuspecting enemy. In addition to the obvious difficulty of maintaining the coherence of his forces at night, Alexander gave Parmenion a more personal reason for rejecting such stealthy action: “I will not demean myself by stealing victory like a thief. Alexander must defeat his enemies openly and honestly.” Nevertheless, that night, believing that Alexander’s troops were moving into battle formation, Darius ordered his men to arms. Waiting the night out in fear of the stealthy attack that Alexander had decided against, Darius’ troops wasted energy they would need in the morning.

As the sun rose on September 30, Alexander delivered a brief address to his officers. They did not need speeches to inspire them, he declared—they had their own courage and pride to sustain them. He asked them to remember that they were not merely fighting for Asia Minor or Egypt, but for sovereignty over all Asia. Then he led his army forward, trailing the main line behind him at an oblique angle of about 30 degrees. The right flank, screened by a small cavalry unit of 600 mercenaries under General Menidas, consisted of two parallel lines of infantry, a line of Thracian cavalry, Macedonian archers and “old mercenaries” (so-called because they had served in his campaign from the beginning).Toward the center were javelineers alongside Alexander’s Royal Guard and his Companion Cavalry, commanded by Philotas. Armed primarily with the xiston, a shortened version of the infantry sarissa, the Companions were divided into eight squadrons and fought in a wedge-shaped or triangular formation, an innovation credited to Philip II.

Alexander’s father had also enhanced the already nearly impenetrable Macedonian phalanx by arming his hoplites, or heavy infantry, with sarissas—spears more than 4 meters in length. Now, their sarissas having been extended to 61⁄2 meters under Alexander’s rule, the phalanx was the center of the Macedonian front. A unit of men most often 16 deep, its spears extended much farther than the swords of the enemy, giving it great strength in the attack. The flanks of the phalanx were protected by some 3,000 troops specially trained for the task, called the Royal Adjutants. At Gaugamela, Alexander had a rough total of 12,000 men in his phalanx battalions, supported from the rear by an additional 12,000 foot soldiers, most of them slingers and javelineers.

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