Battle of Lewes

Timeline

1. 1263–1264Southern England · EnglandAfter the Provisions of Oxford in 1258, Henry III and the reformist barons repeatedly fell out; conflict escalated into open civil war in 1263-1264. Montfort returned from the continent and mustered the baronial army; royal and reformist forces maneuvered opposite each other south of the Thames, and conditions for a decisive battle formed near Lewes.
2. 1264Offham Hill (west of Lewes) · SussexOn the night of May 13, Montfort's forces advanced from Fletching to the heights west of Lewes. At dawn the next day they deployed from high ground: Edward commanded the royal right against the London militia, while Henry III and Richard of Cornwall held the center and left. The reformists used terrain to offset their numerical disadvantage.
3. 1264Lewes battlefield · SussexDuring the battle Edward routed the London militia on the opposing left and pursued them off the field, leaving the royal center without coordination. Montfort concentrated his forces against Henry III's own position; the king withdrew into Lewes Priory and Richard was trapped in the windmill castle. When Edward returned the outcome was already decided, and he was forced to accept a truce.
4. 1264Lewes · SussexThe two sides agreed on the Mise of Lewes: Henry III and Edward were placed under reformist control, restoring noble participation in government along the lines of the Provisions of Oxford. Montfort became the effective ruler of England until Edward escaped in 1265 and killed him at Evesham.