On Zizka's Battle Waggon (1968)

Widowed yeoman Tuma and his household are on their way to help the town of Kourim, which is under attack by the papist troops. His son Ondra is secretly following his father. Miksík the castellan, who is responsible for Ondra, finds himself forced to set off after the boy. They are both captured by soldiers from Kutná Hora. Miksík sacrifices himself to give Ondra a chance to flee. On the way, Ondra runs into the orphan Sulík. The two boys become friends and begin to wander together.