In 331 BC, Alexander the Great faced Darius III of Persia at the Battle of Gaugamela. (Site is estimated to be near Mosul in northern Iraq).
Oliver Stone's epic 2004 movie was criticised in some quarters, but is historically accurate and a worthy attempt.
In the battle, "Alexander's plan was to draw as much of the Persian cavalry as possible to the flanks. The purpose of this was to create a gap within the enemy line where a decisive blow could then be struck at Darius in the centre."