Showing Countenance of War: A Novel of Scotland by J.R. Tomlin

Fourteenth-century Scotland suffers under the heel of England's King Edward, and James Douglas refuses to submit to the conqueror. As he wages a scorched-earth guerilla war to drive out the invader and reclaim his birthright, Edward brings a vast army to crush the Scots. In the midst of the brutal war, even the woman James loves is threatened by his implacable duty.
A man caught in the clash of two nations rushes to his destiny in this novel of passion, loyalty, cunning, and ruthlessness. The conflict reaches a bloody crescendo as the Scots and English cross swords in a reckoning that will determine Scotland's very survival.