Even before the agreement was concluded the Islemen took to arms, advancing eastwards under the command of Angus Og, John's illegitimate son. Once again Inverness was captured and the people of the north instructed to deny the authority of James III. Beyond this we know nothing from the sparse contemporary sources, not even how this rebellion was brought under control. It most certainly had the effect Edward desired; for the Scottish government, faced with rebellion in the north, and fearful of attack in the south, dropped the politically embarrassing Lancastrian connection. John, presumably now aware how worthless the Westminster agreement truly was, backed down, declaring his seizure of the Inverness customs had been illegal. No further action was taken against him – for the present.