By 1290 the Christian Kingdom of Jerussalem has been reduced to a few fortresses on the coast, ruled by the 
absent King Henry II (III of Cyprus). That year street rioting between Christian and Moslems in Acre, the strongest of the remaining Frankish forts, prompted the Egyptian Sultan Al-Ashraf to organize an offensive against Acre. On April 6, 1291, the Mamelukes, with 60,000 horsemen and 100,000 foot soldiers, laid siege to the city. Amalric, brother of King Henry, commanded the Christian garrison, which consisted 1,000 mounted men and 15,000 infantry.Despite heavy bombardment from Egyptian siege engines, Acre resisted stoutly. On May 4, King Henry arrived from Cyprus with reinforcements -100 knights and 2,000 infantry- but they were not enough to counterbalance the steady attrition brought on by moslem attacks. The outer wall fell on May 15, and in general assault three days later the Mamelukes stormed the inner gates and burst into the city. The King and his brother escaped with few nobles to Cyprus, while other Christians fought hopelessly in the streets. By the end of the day the Mamelukes victory was complete. Most of defenders died fighting, the others fell into captivity and were sold off as slaves. Acre was thoroughly sacked and its fortifications demolished.
On the following day, May 19, the garrison at Tyre, abandoned that city in the face of a threatened attack. Sidon and Beirut feel in July, the Mount Carmel Monastries in August. By the end of summer the last of the Frankish warriors had been erased from asian mainland. Syria and Palestine lay under moslem dominion as complete as that in 1097 when the first crusade began.