In the year 630, during the Islamic prophet Muhammad's lifetime, many Jordanian Christians joined Muhammad's army led by his adopted son Zeid ibn Haritha and his cousin Jafar bin Abi Taleb, and fought against the Byzantine army of their fellow Orthodox Christians at the Battle of Mutah in Karak (it is because of this battle that they earned their tribal name "'Uzaizat" which means "the reinforcements"—and Archbishop Fouad Twal himself comes from these tribes). In 1099, during the First Crusade, some were killed by Crusaders at the Fall of Jerusalem alongside the Muslims. Later from 1916–1918 during the Great Arab Revolt they fought with the Muslim Arabs against the Ottoman forces; they thereafter languished for a few decades along with their Muslim fellows under a Protestant Colonial Mandate, and in the Israeli Arab Wars of 1948, 1967 and 1968 they fought with Muslim Arabs against Israel. Christian Jordanians have not only defended Jordan, but have also helped to build Jordan, playing leading roles in the fields of politics, education, health, commerce, tourism, agriculture, science, culture and numerous other fields.