King Henry III: Border Knight Book 6

Sir Thomas of Stockton has lost his son. Taking a handful of chosen men, he crosses the seas to travel through France seeking his enemy. Fate throws him in with a French lord and he meets the French King Louis. After exacting revenge, he returns to England where he helps King Henry plan and execute his campaign Poitou. The King comes of age when he and Sir Thomas lead their men against French and Poitevin rebels.