It probably didn't help Edward II that he had Robert the Bruce in Scotland to fight who was most certainly an actual stupendous badass but even he was employed on condition that:
"if he should give up what he has begun, and agree to make us or our kingdom subject to the King of England or the English, we should exert ourselves at once to drive him out as our enemy and a subverter of his own rights and ours, and make some other man who was well able to defend us as our King"
"if he should give up what he has begun, and agree to make us or our kingdom subject to the King of England or the English, we should exert ourselves at once to drive him out as our enemy and a subverter of his own rights and ours, and make some other man who was well able to defend us as our King"