André Geraque Kiffer 
Battle Of Arbelas, October 1st, 331 Bc [PDF ebook] 

In the historical simulation will be considered the hypothesis of whether it would have been possible to the Persians, being strategically defensive, were, mainly because of the favorable terrain, tactically offensive. As a result, in the operational strategy the Persian battle approach would be more aggressive, anticipating Macedonian movements, particularly exploiting its moving forces (cavalry, chariots and elephants). In tactics, the decisive moment of concentrating the maximum combat power would be in the place and in the period of performance of Alexander himself.