The Children's Crusade — Jack E. Jon

It is the time of the Crusade. Europe is swept by a religious fervor. Based on a true story where thousands of children board ships bound for Jerusalem to liberate the Holy Land.
Vincent, the son of a French nobleman, joins the expedition, but he is on his own crusade to find his missing father, believed killed in the previous crusade. With the help and love of a beautiful princess, nothing will stop his daring quest.