In his mid twenties, he traveled to negotiate with Emperor Nero for the release of some Jewish priests. Upon his return to Jerusalem, at the outbreak of the First Jewish–Roman War, Josephus was appointed the military governor of Galilee. His arrival in Galilee, however, was fraught with internal division: the inhabitants of Sepphoris and Tiberias opting to maintain peace with the Romans; the people of Sepphoris enlisting the help of the Roman army to protect their city, whilst the people of Tiberias appealing to King Agrippa's forces to protect them from the insurgents. Josephus also contended with John of Gischala who had also set his sight over the control of Galilee. Like Josephus, John had amassed to himself a large band of supporters from Gischala (Gush Halab) and Gabara, including the support of the Sanhedrin in Jerusalem. Meanwhile, Josephus fortified several towns and villages in Lower Galilee, among which were Tiberias, Bersabe, Selamin, Japha, and Tarichaea, in anticipation of a Roman onslaught. In Upper Galilee, he fortified the towns of Jamnith, Seph, Mero, and Achabare, among other places. Josephus, with the Galileans under his command, managed to bring both Sepphoris and Tiberias into subjection, but was eventually forced to relinquish his hold on Sepphoris by the arrival of Roman forces under Placidus the tribune and later by Vespasian himself. Josephus first engaged the Roman army at a village called Garis, where he launched an attack against Sepphoris a second time, before being repulsed. At length, he resisted the Roman army in its siege of Yodfat (Jotapata) until it fell to the Roman army in the lunar month of Tammuz, in the thirteenth year of Nero's reign.