A crusade to the Holy Land in 1212 by tens of thousands of children, chiefly from France and Germany. Most never reached their destination, and were sold into slavery.
Definition of Children's Crusade in US English:
Children's Crusade
proper noun
A crusade to the Holy Land in 1212 by tens of thousands of children, chiefly from France and Germany. Most of the children never reached their destination, and were sold into slavery.