...What is known for certain about the misnamed “Children’s Crusade” is that between Easter and Pentecost of 1212, young people in the Chartrain region of France near Paris, motivated by religious fervor, took the cross. The movement grew in strength and numbers...
Check the Library eResources site and select Britannica High level.
There are entries under CRUSADES for the Children's Crusade.
Gustave Dore : The Children's Crusade, Lithograph, 1877 Public Domain, Wikiart