During this period Dufay probably wrote his mass based on the song L'homme armÃ , as well as the chanson based on the same song . Maybe he wrote this when Philip the Good called for a new crusade against the Turks , who had recently captured Constantinople . During this period he probably wrote his mass based on L'homme armÃ , as well as the chanson on the same song ; the latter composition may have been inspired by Philip the Good 's call for a new crusade against the Turks , who had recently captured Constantinople .