As the war continued, Falkes took control of Plympton, Christchurch and Carisbrooke castles, whilst continuing to hold onto Bedford. After the death of King John in 1216 the war turned against the rebel barons and the royalist faction, including Falkes, was able to restore his son, the young Henry III to power in England. After the war, Falkes made Bedford Castle his headquarters and he expanded it considerably, resulting in what David Baker has described as a "major refortification". Falkes destroyed the neighbouring churches of St Paul's and St Cuthbert's to make space for a new bailey, reusing the stone for the castle. The exact form of the castle after this expansion remains uncertain. The castle appears to have been quadrangular, with the western edge running along the rear of the modern High Street and the northern edge running along the modern roads of Ram Yard and Castle Lane. The castle had a new barbican; an outer and an inner bailey, with the inner bailey in the south-east corner, protected by an internal ditch and a stone-lined palisade; further stone lined ditches lay around the castle; and a new keep was built on the motte. Brown suspects that the new keep was probably a shell keep with a tower, similar to those built at Launceston or Bungay. The stone-lined palisades and ditches built at Bedford were very unusual in England – their closest equivalent are those found at Skenfrith Castle in Wales. The castle had a postern watergate facing towards the river, and a great hall within the inner bailey in the middle, at least 13 m (43 feet) wide and 40 m (131 feet) long. There was possibly a large stone gatehouse positioned on the outer bailey wall. A mound in the north-east corner of the castle probably supported a large tower. Siege of 1224 Henry III decided that Bedford Castle should be returned to its original owner, William de Beauchamp, and became increasingly frustrated with Falkes' refusal to do so; matters came to a head when Falkes' castellans imprisoned Henry of Braybrooke, a royal judge who was hearing law cases against Falkes. When Falkes refused to release the judge, Henry mobilised an army, supported by the Church in the form of Stephen Langton, the Archbishop of Canterbury, and advanced to Bedford. Falkes had left the castle, along with around eighty men, in charge of his brother, William de