It's not clear whether this 'great battle' refers to the battle of Issus or of Gaugamela, or both.
Alexander the Great explored the Afghan areas between Bactria and the Indus River after his conquest of the Achaemenid Empire in 330 BC.
tries without success to alter the course of history for his own benefit, including thwarting the course of ancient historical events like the Battle of Arbela between Greece and Persia in 331 B.C., thus halting technological development and allowing him and his henchmen to conquer an America of medieval-levels of technology with modern weapons which he had left in specially-prepared caves, safe from the alterations to the time stream.
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The fourth and fifth battles are respectively the Battle of Issus and the Battle of Gaugamela against King Darius III of Persia.
The sarissa-wielding phalanxes were vital in every early battle, including the pivotal battle of Gaugamela where the Persian king's scythe chariots were utterly destroyed by the phalanx, supported by the combined use of companion cavalry and peltasts (javelineers).