Gates to Paradise (also known as Vrata Raja) is a 1968 film by Polish director Andrzej Wajda and starring Lionel Stander, Ferdy Mayne and Mathieu Carrière.
[1] The film is set in medieval France and is based on the 1960 novel by Polish writer Jerzy Andrzejewski that seeks to expose the motives behind youthful religious zeal.
A monk, returning from Jerusalem, joins the crusade and hears the children's confessions, gradually realizing that most of them are taking part not for religious, but for more worldly reasons, like rejected love.
This allows Alexander to take revenge for the count's infidelity by telling his beloved Jakob about the count's recent demise by drowning in a river, watched by an unmoved Alexander.
Finally, it is revealed in Jakob's confession that Jakob received the inspiration for the crusade not from God but from the Count, which means that the crusade must fail because it is not by the will of God.