Persian king Darius III failed to appreciate tactics & lost his empire to this great leader in 331 B.C.
In 334 BC, 
Alexander the Great began his invasion of the Persian Empire... [DOC] [TLE] Wars of Alexander the Great - Wikipedia [PAR] The wars of Alexander the Great were fought by King Alexander III of Macedon ("
The Great"), first against the Achaemenid Persian Empire under Darius III, ...