 Nyorai kupfuurira kweiyi ndima - Akakomberedzwa, Montfort aifanira kugamuchira runyararo ndokubvuma kutumira nhau yacho kuti itongwe namambo weFrance Louis IX. NeMise yeAmiens, Louis akasarudza chose chose Henry, uye akaramba zvinhu zvacho. Chibvumirano chacho hachina kupa mhinduro yekurwisana kwacho, asi chakatoita kuti pave nemamwe matambudziko. Chisarudzo chakatorwa norutivi rumwe chokutsigira mambo uye kurwisa varanda chakasiya Montfort asina zvimwe zvaaigona kuita kunze kwokupandukira nezvombo. Hondo dzakatanga kare muna February, apo vanakomana vaMontfort, Henry naSimon Muduku, vakarwisa zvinhu zvaRoger Mortimer muMarches. Henry akadana uto rehurumende, uye mauto oumambo akawana rukundo runokosha paNorthampton, apo Simon muduku akabatwa. Montfort akanga achiri kudzora London, sezvo Henry akawanazve kudzora Kent neSussex. Montfort akabuda muLondon kunotaurirana, asi chibvumirano chaibatanidza kuchengetedzwa kwezvirongwa chakarambwa namambo. Chisarudzo bedzi chakanga chasara chakanga chiri chokurwa, uye masimba maviri akasangana paLewes pana 14 May 1264. Pasinei zvapo nokuva vashoma munhamba, mauto amambo aitungamirirwa naSimon de Montfort akakunda muhondo yacho. Edward, achitungamirira rutivi rworudyi, akakurumidza kukurira mauto eLondon. Zvisinei, paakatanga kudzingirira varwi vakanga vachitiza, akasiya vamwe varwi vose vamambo vari pachena. Mauto ebaronial akashandisa mamiriro acho ezvinhu, uye nokukurumidza akakunda. 