One of the most famous generals all time, Alexander was just 20 when he led his army into battle at Granicus. Despite his youth and his army being heavily outnumbered, he was victorious, and it was this victory that allowed him to conquer Asia Minor. The course of this key battle remains controversial due to conflicting accounts in contemporary sources. This study carefully balances the evidence from textual sources with information of the battlefield and reconstructed weaponry in order to explain the events of the battle and the context in which it took place.