 The disagreements between the leading barons involved in the revolt soon became evident . Montfort championed radical reforms that would place further limitations on the authority and power of the major barons as well as the Crown ; others promoted only moderate change , while the conservative barons expressed concerns about the existing limitations on the King 's powers . Over the next four years , neither Henry nor the barons were able to restore stability in England , and power swung back and forth between the different factions . By early <unk> , what remained of Henry 's authority had <unk> and the country slipped back towards open civil war . Montfort convened a council of rebel barons in Oxford to pursue his radical agenda and by October , England faced a likely civil war . Montfort marched east with an army and London rose up in revolt . Montfort took Henry and Queen Eleanor prisoner , and although he maintained a fiction of ruling in Henry 's name , the rebels completely replaced the royal government and household with their own , trusted men . 
