User blog comment:The Deadliest Warrior/Alexander the Great vs. Genghis Khan: The Greatest Men on Earth Round 1/@comment-181289-20101129034548

The Phalanx formations only real weakness is it's slow pace and the flanks and rear, but Aleanander (or you could say Philip) compensated for this weakness by incorperating Cavelry into his army, making it hard to hit the Phalanex at it's weak points, meaing you either have to hit it head on (and get your self killed) or try and fight through the Macedonian cavalry. While the Mongols will have the advantag of hittiing as a range, the Macedonians will crush them in close, and given there armour, the Mongol archers wouldn't prove to be an abnormaly large threat.

Then of course there's the Hammer and Anvil tatic Alexander is famous for. Let the enemy take the Phalance ond infintry while he and Calvelry move around and trap them.