WI Regent Eustace Grenier loses battle of Yibneh in 1123?

In 1123, the new Fatimid Vizier Al-Mamun organized a major invasion of Crusader lands. The Fatimids planned to capture the coastal city of Jaffa. In this era, the Egyptian armies usually deployed with Sudanese archers on foot, supported by dense formations of Arab and Berber light cavalry. Unfortunately for the Fatimids, this relatively immobile array provided the Frankish heavy cavalry with an ideal target.
At Yibneh, near the later site of the castle d'Ibelin (built 1141), the Fatimid invasion force encountered the crusader army of knights and men-at-arms on horseback and spearmen and bowmen on foot. The fighting lasted only short time as Egyptian host was unable to withstand the shock of the Crusader cavalry charges.
The defeat was decisive. Except for continued raids from Ascalon until the Siege of Ascalon in 1153, the Fatimids ceased to be a threat to the Crusader states until the rise of Saladin in 1169.
WI Grenier lost that battle if suddenly Al-Mamun changes his battle plans to deal with Frankish knights more efficiently? How is a potential Crusaders defeat alters History? Any thoughts?
 
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