Battle of Issus - Battle

Battle

The Macedonians advanced through the Pillar of Jonah. Alexander led his Companion cavalry on the right flank and he set his Thessalian allied cavalry on the left of the phalanx with Parmenion in command.

Darius formed his line with his heavy cavalry concentrated next to the coast on his right, followed by the Greek mercenary phalanx (historian A.M Devine places them at a strength of 12,000, comparable to the Macedonian phalanx). Next to the Greek phalanx Darius spread his Persian infantry, the Cardaces, along the river and into the foothills, where they wrapped around to the other bank and threatened Alexander's right flank (the formation resembled gamma, Γ). Arrian gives an inflated figure of 20,000 to these troops. Darius positioned himself in the centre with his best infantry, the Greek mercenaries, and his royal cavalry guard. According to some historians, like P. Stratikis, he was trying to replicate the Hellenic battle formation of the Battle of the Granicus.

The Persian cavalry first charged Parmenion and the allied cavalry, crossing the river to open battle. Alexander's left wing once again became the crux of the battle, as at Gaugamela two years later, where Parmenion held the wing long enough against superior Persian numbers for Alexander to make his calculated cavalry strike against Darius and break the Persian army. The Hypaspists led by Alexander, on foot, delivered an assault during this time across the riverbed on the Cardaces and managed to punch a hole through the Persian line.

Alexander then mounted a horse at the head of his Companion cavalry and led a direct assault against Darius who fled from the battlefield. Alexander then saw his left flank and center in trouble, let Darius flee, and crashed into the rear of the Greek mercenaries. The Greek mercenaries broke up. The Persians saw that their Great King had gone and that the battle was being lost, and they abandoned their positions and fled in full rout. The Macedonian cavalry pursued the fleeing Persians for as long as there was light. As with most ancient battles, significant carnage occurred after the battle as pursuing Macedonians slaughtered their crowded, disorganized foe. Arrian notes Ptolemy I mentions that, while pursuing Darius, Alexander and his bodyguards came upon a gap which they effortlessly crossed on the bodies of dead Persians. It was a decisive victory for Alexander.