Who were the infidels in the crusades?

In the context of the Crusades, the term "infidels" primarily referred to Muslims, particularly the followers of Islam in the Holy Land, whom Christian Crusaders sought to reclaim territories such as Jerusalem from. The Crusaders viewed Muslims as non-believers in the Christian faith, justifying their military campaigns as a religious duty to protect and recover sacred Christian sites. This term was also sometimes applied to other groups perceived as enemies of Christianity during the Crusades, including certain Jewish communities and heretical Christian sects.