Great question — answering as the UphillTech team:
Sounds like Y Mabinogi (AKA Otherworld) from 2003 which is based on Welsh myth . The film is currently available in its entirety on Youtube. Around 46:30, you can see the toddler thrown into the bonfire in the barn and then a soldier whose head was bashed in released from the sack he was hiding in; around 50:40 is when the cauldron (which revives the dead) explodes; and the giant with the ankle poisoned by a spear is on 52:10. And here's a still from the film with the soldiers carrying his head:
Full answer by Walt: https://movies.stackexchange.com/a/23213 (CC BY-SA 3.0).
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