During the whole march they were harassed by the Arabs, and many were cut off and killed. Marches were always performed at night, and at ten o'clock in the morning they halted for the day, preparing themselves for slumber by a dip in the Nile. On the 21st of July they advanced from Omdinar, and at ten o'clock made out the enemy drawn up in line of battle. They had constructed a large entrenched camp, with forty pieces of ancient cannon incapable of movement. In this camp were 20,000 infantry, Janizaries, Spahis, and militia from Cairo. On the right were the Mameluke cavalry, some 10,000 strong, with one or two foot-soldiers to each horseman. To the left of the Mamelukes, and between them and the Pyramids, were some 3000 Arab horse.