Book 4, Chapter 10 Summary

Merlin goes to Killare. Gilloman flees, when Uther and his men arrive. It was an easy battle for him. Tremorinus the engineer has a go at the Black Stone of Killare. No one can figure out how to bring it down.

Merlin somehow figures out how to dig it up. He describes the feat as engineering and not magic, though he says it is recounted as magic. He takes this stone that Ambrosius want. Uther was there, too, trying to figure out how to dig the stone out and return it to Britain. He could not do it. Merlin takes the stone and travels back with it.

Merlin returns to Caerleon and learns Ambrosius went into battle at Carlisle and won. He returned to Winchester and takes ill. Some said it was poison. Ambrosius dies. Merlin returns with the stones and...