A detailed, academic, yet highly readable account of the French invasion - specifically focusing on military history and battle by battle - during the First Barons’ War. Well researched with lots of footnotes, McGlynn cites all the leading "johannites" both pro and con.
It opens explaining the interactions between K John and K Phillip Augusta. Philip’s systematic dismantling of the Angevin Empire, from John’s loss of Normandy in 1204 to the decisive French victory at Bouvines in 1214. McGlynn shows how Philip’s mastery of feudal law, alliance-building, and opportunistic warfare made him one of medieval Europe’s most formidable rulers. In many ways, K Phillip is the architect of the First Barons War.
In 1215, King John’s disastrous reign—marked by heavy taxation, failed wars, and ruthless reprisals—finally drove a group of rebellious barons (The Northerners) to open revolt. John’s refusal to adhere to the terms of Magna Carta were the final straw. The rebels took an extraordinary step: they invited Prince Louis of France to take the English crown.
In May 1216, Louis landed in Kent with a powerful army and quickly gained ground. London welcomed him, and many English castles switched allegiance, the regular population caught in the crossfire. [Unlike other histories, McGlynn frequently mentions the devastation inflicted on the civilian population, describing the atrocities, torture and scorched-earth policies that made war in the middle ages so destructive.] King John, increasingly isolated, resorted to a scorched-earth strategy, burning towns and destroying crops to deny Louis resources. His cruelty alienated even more supporters, but his sudden death from dysentery in October 1216 changed the game.
With John gone, the crown passed to his nine-year-old son, Henry III, ("When Henry shrugged his shoulders, all John's crimes slip away") under the guardianship of the legendary knight William Marshal. Marshal skillfully reframed the war as a defense of a rightful child-king against a foreign invader, persuading many barons to return to the royalist cause.
1217: At sea, England's fleet crushed the French navy at the Battle of Sandwich, cutting off all Louis’s hopes of reinforcements. On land, Marshal’s forces won a decisive victory at the Battle of Lincoln, routing Louis’s allies and capturing key rebel leaders.
Facing dwindling support and a hopeless military situation, Louis signed the Treaty of Lambeth in September 1217, renouncing his claim to the throne in exchange for safe passage home and payment of his debts. The invasion collapsed, Henry III’s rule was secured.