He then went back to Tyre, and thence set out for the East.  A bridge was thrown across the Euphrates, but the Tigris was forded by the foot soldiers, holding their shields above their heads out of the water.  On the other side Darius was waiting with all the men of the East to fight for their homes, not for distant possessions, as had been the lands of Asia Minor, Syria, and Egypt.  The Greeks had four days’ march along the banks of the Tigris before coming in sight of the Persian host at Arbela. It was so late that the two armies slept in sight of one another. Parmenio advised the king to make a night attack, but all the answer he got was, “It would be base to steal a victory;” and when he came in the morning to say that all was ready, he found his master fast asleep, and asked him how he could rest so calmly with one of the greatest battles in the world before him.  “How could we not be calm,” replied Alexander, “since the enemy is coming to deliver himself into our hands?”