Assuming you mean a crusade:
Crusades were religious calls of duty to the Roman Catholics in Europe during the the medieval ages. They were called by the Popes to capture certain towns controlled by those who were against the religion. Crusades were most commonly held on the middle eastern coast, and the most common city was Jerusalem.
The last answer was incorrect.
Venice, Italy.
a knight became a crusader when he rode with the armies to the holy land A crusade in Medeval Catholic Europe was called by the pope. If a knight took up the call to arms and travelled to the destination (the most famous being of course Jerusalem) he became a crusader knight. However any man who travelled to the holy land on request of the pope was a crusader, even peasants. people often went on crusade for the promise of pludering the rich Islamic States but also because it was told that any man who died on cursade would have all his sins forgiven and gain acess to heaven
Children's Crusade illustrates at once the religious enthusiasm and misdirected zeal which marked the whole crusading movement. During the interval between the Fourth and the Fifth Crusade, the epidemical fanaticism that had so long agitated Europe seized upon the children, resulting in what is known as the Children's Crusade.