During the siege of Jerusalem by the First Crusade in 1099, the Jewish inhabitants of the city fought side by side with the Fatimid garrison and the Muslim population who tried in vain to defend the city against the Crusaders. When the city fell, around 60,000 people were massacred, including 6,000 Jews seeking refuge in a synagogue. At this time, a full thousand years after the fall of the Jewish state, there were Jewish communities all over the country. Fifty of them are known and include Jerusalem, Tiberias, Ramleh, Ashkelon, Caesarea, and Gaza. According to Albert of Aachen, the Jewish residents of Haifa were the main fighting force of the city, and "mixed with Saracen [Fatimid] troops", they fought bravely for close to a month until forced into retreat by the Crusader fleet and land army.