Set in 5th century Britain the Saxons and Celts are vying for control over the land. Each side uses both knights and magicians. Knights move overland from one province to the next in a predictable way, whereas magicians use places of power to appear just where their enemy thought was secure, and thus the struggle flows back and forth until one side gains the upper hand. Unusual in that two subgames are really being played at the same time, and deciding which to focus on can be a challenge.