Titus began his siege a few days before Passover, on 14 April, surrounding the city with three legions (V Macedonica, XII Fulminata, XV Apollinaris) on the western side and a fourth (X Fretensis) on the Mount of Olives, to the east. If the reference in his Jewish War at 6:421 is to Titus' siege, though difficulties exist with its interpretation, then at the time, according to Josephus, Jerusalem was thronged with many people who had come to celebrate Passover.