Alexander was at Thapsacus in July 331. Darius learned of this action from an advanced army sent under Mazaeus to the Euphrates crossing and marched up the Tigris to fight him.
This is further explained below.
<h3>Briefly describe the route Alexander the Great traveled during his conquest of the entire Persian Empire.?</h3>
Generally, Cyrus the Great established the Achaemenid Empire in 550 BC. It was also known as the First Persian Empire.
In conclusion, In the month of July 331, Alexander made his way to the Euphrates port of Thapsacus. Darius, hearing of this action from an advance army sent under Mazaeus to the Euphrates crossing, marched up the Tigris to fight him. Instead of taking the usual path down the river to Babylon, he proceeded through northern Mesopotamia for the Tigris.
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