Now, as Titus was on his march he chose out 600 select horsemen, and went to take a view of the city, when suddenly an immense multitude burst forth from the gate over against the monuments of Queen Helena and intercepted him and a few others. He had on neither helmet nor breastplate, yet though many darts were hurled at him, all missed him, as if by some purpose of Providence, and, charging through the midst of his foes, he escaped unhurt. Part of the army now advanced to Scopos, within a mile of the city, while another occupied a station at the foot of the Mount of Olives. Seeing this gathering of the Roman forces, the factions within Jerusalem for the first time felt the necessity for concord, as Eleazar from the summit of the Temple, John from the porticoes of the outer court, and Simon from the heights of Sion watched the Roman camps forming thus so near the walls. Making terms with each other, they agreed to make an attack at the same moment. Their followers, rushing suddenly forth along the valley of Jehoshaphat, fell with violence on the 10th legion, encamped at the foot of the Mount of Olives, and working there unarmed at the entrenchments. The soldiers fell back, many being killed. Witnessing their peril, Titus, with picked troops, fell on the flank of the Jews and drove them into the city with great loss. The Roman commander now carefully pushed forward his approaches, leveling the whole plain of Scopos to the outward wall and destroying all the beautiful gardens with their fountains and water-courses, and the army took up a position all along the northern and the western wall, the footmen being drawn up in seven lines, with the horsemen in three lines behind, and the archers between. Jerusalem was fortified by three walls. These were not one within the other, for each defended one of the quarters into which the city was divided. The first, or outermost, encompassed Bezetha, the next protected the citadel of the Antonia and the northern front of the Temple, and the third, or old, and innermost wall was that of Sion. Many towers, 35 feet high and 35 feet broad, each surmounted with lofty chambers and with great tanks for rain water, guarded the whole circuit of the walls, 90 being in the first wall, 14 in the second, and 60 in the third. The whole circuit of the city was about 33 stadia (four miles). From their pent-houses of wicker the Romans, with great toil day and night, discharged arrows and stones, which slew many of the citizens.