To achieve this, John reformed the English feudal contribution to his campaigns, creating a more flexible system under which only one knight in ten would actually be mobilised, but would be financially supported by the other nine; knights would serve for an indefinite period.
Para lograr isto, creou a contribución feudal para as súas campañas, cun sistema máis flexible baixo o cal un cabaleiro de cada dez sería mobilizado, pero estaría apoiado financeiramente polos outros nove.