THE RETREAT OF THE TEN THOUSAND. 239 lest they might be surprised when their horses were shackled and they unarmed. This custom the Greeks now took advantage of. As soon as the enemy had withdrawn to their nightly camp the march was re- sumed and continued for some ten miles. The dis- tance gained gave the Greeks two days of peaceful progress before their foes came up again. On the fourth day the Greeks saw before them a lofty hill, which must be passed, and which their enemies occupied, having got past them in the night. Their march seemed at an end, for the path that must be taken was completely commanded by the weapons of the foe. What was to be done?