Extending to the left of the central phalanx battalions were light infantry and Greek horsemen, including the powerful Thessalian cavalry under General Parmenion. Each Thessalian squadron formed a tactical unit arranged in rhomboid or diamond formation, whose primary task was to hold the left wing steady. Again, the cavalry protected the flanks of a force of mercenaries. All told, Alexander’s infantry numbered approximately 40,000. His foot soldiers were screened by cavalry so that his line appeared much weaker than it was—an intentional arrangement.

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As Alexander marched, he offered Darius the tempting bait of a shorter Macedonian right flank against a longer Persian left. Still, the Persians stood fast, and as Alexander continued extending his line, he threatened to move the battle off the ground specially prepared for cavalry and chariot maneuvers. It became a contest of nerves. Darius, meanwhile, continued inching his front to the left to match Alexander’s movement. Finally, he ordered the foremost cavalry on his left wing into action to halt Alexander’s march. Menidas’ outnumbered cavalry raised their war cries and charged. But the intention of their attack was to entice, and therefore irretrievably commit the Persian left wing. Just as fast as they advanced, the mercenaries feigned intimidation at Darius’ numbers and broke off their attack. The Persian left pursued vigorously, not expecting the scores of infantry lying in wait behind the Macedonian right.

Darius then called his next shot. The main body of cavalry, a fighting force of roughly 8,000 commanded by his cousin, Bessus, thundered into the assault. Blade met blade as Greek infantry dodged the cavalry and absorbed the strength of a significant number of Darius’ best. The odds against Alexander’s Companion Cavalry, still awaiting its moment, were thereby reduced. Meanwhile, Darius launched his scythe chariots and sent his elephants into action. Alexander deployed his javelineers, whose missiles killed or disabled most of the chariot drivers before they had a chance to inflict any damage. While intimidating in size, the elephants did little more than create a manageable degree of chaos and interference—most of Alexander’s troops simply parted ranks and let the charging beasts pass.

Still, Darius must have felt confident. The elephants were an experiment. The chariots, though they had failed in other confrontations, had been worth another try. But the Macedonian right wing was heavily engaged. Darius ordered a general advance, pouring more men into the mayhem on his left. To his right, Mazaeus’ cavalry was unleashed against Parmenion’s cavalry and phalanx. Without knowing it, Darius was further reducing the odds against Alexander’s Companions, who still waited to launch their decisive charge against Darius and his royal guards. Adding to that fact, an awkward situation was developing near the junction of the Persian center and the Persian left wing. As men poured into the Macedonian right wing and the struggle there intensified, the battle line stretched still farther to the left, thinning and therefore weakening the Persian front.

At that point, the only Persian cavalry still not committed to the battle were those roughly opposite Alexander and his Companions. Those were most important for Alexander to personally engage—Darius’ kinsmen and guards, and the king himself. The Persians had sacrificed depth in the process of extending their line in an effort to keep their front continuous. The Companions were now ready to crash into the loosely woven Persian ranks. Alexander gathered his still-available forces into a gigantic wedge. At the tip of this wedge was the Royal Guard and Companion Cavalry. Trailing down on the left were the remaining phalanx battalions; on the right were the Thracian infantry and archers as well as the javelineers who had been previously deployed against the chariots.

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