Why did Pope Urban II attack the Seljuk Turks in the Holy Land?

Pope Urban II launched the First Crusade in 1095 primarily to reclaim the Holy Land from the Seljuk Turks, who had gained control over Jerusalem and threatened Christian access to sacred sites. He aimed to unite Christians in Europe against a common enemy, bolster the Church's influence, and respond to the Byzantine Emperor's plea for military assistance against the Turkish incursions. Urban's call also sought to channel the growing fervor for pilgrimage and religious zeal into a unified military campaign, promising spiritual rewards for those who participated.