Completar frases CrusadesVersión en línea A brief description of Crusades using key vocabulary. por Alfonso Poza 1 Crusades military expeditions , beginning in the late century , organized by western European . Their objectives were to the spread of Islam , to retake control of the Land in the eastern Mediterranean and to recapture formerly Christian ; they were seen by many of their participants as a means of redemption and expiation for . Crusades began in , when the First Crusade was launched , and ended in , when the Christians were finally expelled from their last in Syria .