Saladin besieged Tiberias in the eastern Galilee on 3 July 1187 and the Crusader army attempted to attack the Ayyubids by way of Kafr Kanna. After hearing of the Crusaders' march, Saladin led his guard back to their main camp at Kafr Sabt, leaving a small detachment at Tiberias. With a clear view of the Crusader army, Saladin ordered al-Muzaffar Umar to block the Crusaders' entry from Hattin by taking a position near Lubya, while Gökböri and his troops were stationed at a hill near al-Shajara. On 4 July the Crusaders advanced toward the Horns of Hattin and charged against the Muslim forces, but were overwhelmed and defeated decisively. Four days after the battle, Saladin invited al-Adil to join him in the reconquest of Palestine, Galilee and Lebanese coast. On 8 July the Crusader stronghold of Acre was captured by Saladin, while his forces seized Nazareth and Saffuriya; other brigades took Haifa, Caesarea, Sebastia and Nablus, while al-Adil conquered Mirabel and Jaffa. On 26 July, Saladin returned to the coast and received the surrender of Sarepta, Sidon, Beirut, and Jableh. In August, the Ayyubids conquered Ramla, Darum, Gaza, Bayt Jibrin, and Latrun. Ascalon was taken on 4 September. In September–October 1187, the Ayyubids besieged Jerusalem, taking possession of it on 2 October, after negotiations with Balian of Ibelin.