Muslim perspective of the crusades.
Jerusalem is important to the muslims because in their religious cause it was a sacred place for them because all these important figures in all religions, and that is why they all fought for jerusalem.
The reason of the crusade muslims is because we took it as an offensive war between us muslims and the christians when they attacked the islamic states. According to www.answer wiki.com
"One of the effects that the crusades had on the muslims were that it united them against the crusaders." According to www.answer wiki.com
"the muslim leader spared the lives any of the remaining christians that lived in jerusalem" according to www.answer wiki.com