The Battle of Tinchebray was fought 28 September 1106, in Tinchebray , Normandy, between an invading force led by King Henry I of England, and his older brother Robert Curthose, the Duke of Normandy. Henry's knights won a decisive victory, capturing Robert and imprisoning him in England and then Wales until Robert's death .
Henry invaded Normandy in 1105, taking Bayeux and Caen. He broke off his campaign because of political problems arising from the Investiture Controversy. With these settled, he returned to Normandy in the spring of 1106. After quickly taking the fortified abbey of Saint-Pierre-sur-Dives , Henry turned south and besieged Tinchebray Castle, on a hill above the town. Tinchebray is on the border of the county of Mortain, in the southwest of Normandy, and was held by William, Count of Mortain, who was one of the few important Norman barons still loyal to Robert. Duke Robert then brought up his forces to break the siege. After some unsuccessful negotiations, Duke Robert decided that a battle in the open was his best option.
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