What if the Crusades would have won the Battle of La Forbie in 1244? Here's how this battle's outcome is described on Wikipedia:
What do you think, @Circle of Willis?
While the Battle of Hattin holds great symbolic importance as having led to the fall of Jerusalem, it was La Forbie that truly marked the collapse of Christian power in Outremer.[citation needed]
What do you think, @Circle of Willis?