In the summer of 70, following a seven-month siege, Titus eventually used the collapse of several of the city walls to breach Jerusalem, ransacking and burning nearly the entire city. The Romans began by attacking the weakest spot: the third wall. It was built shortly before the siege so it did not have as much time invested in its protection. They succeeded towards the end of May and shortly afterwards broke through the more important second wall. During the final stages of the Roman attack, Zealots under John of Giscala still held the Temple, while the Sicarii, led by Simon Bar Giora, held the upper city. The Second Temple (the renovated Herod's Temple), one of the last fortified bastions of the rebellion, was destroyed on Tisha B'Av (29 or 30 July 70).