After these debacles, the Fatimids abstained from any action against the Crusader Kingdom of Jerusalem, and nothing is heard of the Fatimid navy, until 1151/2. In that year, as a retaliation for the Crusader sack of Farama, the vizier Ibn al-Sallar equipped a fleet—reportedly to the cost of 300,000 dinars—to raid Christian shipping from Jaffa to Tripoli. The raid was evidently successful, with several Byzantine and Crusader ships captured. In 1153, the Crusaders laid siege to Ascalon. The Fatimid navy was mobilized to ferry supplies and reinforcements into the besieged city, but this was unable to prevent its fall on 22 August. Despite the loss of this important base, the Fatimid navy remained active off the Levant coast in the following years: the harbour of Tyre was successfully raided in 1155/6, and in the next year, the Egyptian fleet appeared before Acre and Beirut. Further raiding expeditions were staged in 1157, when the fleet returned to Egypt with 700 prisoners; and in 1158, when a squadron of five galleys raided Christian shipping, and the Alexandria squadron likewise engaged in raids.