First Crusade defeated outside Jerusalem?

So, what if, the relief fleet that landed at Jaffa on June 17th 1099 which brought the Crusaders equipment to be able to assault the Holy City was lost at sea? The Crusaders are caught unprepared a few weeks later outside the walls of Jerusalem by a large Fatimid army and wiped out. How does Europe respond?

Bear in mind that Antioch and Edessa are still in the hands of the Latins, and the Byzantines are campaigning in southern Anatolia at the time. What plays out in the next few years?
 
The Crusaders are caught unprepared a few weeks later outside the walls of Jerusalem by a large Fatimid army and wiped out. How does Europe respond?

In fact, I remember that in chronicles, a crusader leader found pieces for siege engines while he isolated himself for shitting. THAT'S what written.

It's very probable that it was the remains of Fatimid siege when they took back the city during 1098, and while one or two siege engines could have more issues than OTL three ones, it could force the Latin to be more careful about it.

For the large fatimid army against an "unprepared" army...I doubt that the Latins being in much trouble than OTL (the Siege of Jerusalem was particularly hard of besiegers, maybe more than besieged) would be enough to make them crushed, just like that.

The Latins always managed to beat the Arabo-Islamic troops even at 3/1 ratio and I even doubt the Fatimid would be able to project more than the 20/25 000 men they sent in Ascalon OTL. Against 12/15 000 Latins it wouldn't be that much easy as you depict it.

Of course, the lack of supplies would be really problematic, but not that much : Crusaders had a whole relativly unprotected countryside to plunder, even at the consequence of a poorer land to conquer (but it wasn't the main preoccupation, it was "Take Jerusalem", end of the story.)
 
First Crusade

It really changes the concept of the crusading movement in general. I don't see much motivation to continue if the First Cruade is defeated. Alexius Comnenus has a pretty good change of regaining Antioch too.
 
It really changes the concept of the crusading movement in general. I don't see much motivation to continue if the First Cruade is defeated.

I'm not sufficiently knowledgeable about the military chances. However, if we suppose that for whatever reason, the crusaders get stuck holding Northern regions without forces for immediate action, I very much agree that there would be little support for them from their homelands. Lacking fresh troops and funds, they will also lose their footholds established so far - may it be to Constantinople, to the Turks, or Damascus.
 
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