Except that the south would not sell out HM and in fact stated multiple times any peace would have to be acceptable to HM as well.
Perdan did not break treaties with HM (I know cause I was there when the matter was handled when Arthur first flipped Perdan Duchy) although I can understand how HM was not happy. And the history of Perdan Mines was simple. When Arthur agreed to bring back Perdan Duchy first time (and became King after that) the Lord of Perdan Mines refused to return with him. Meuse Mullhouse fall in the same category but Perdan allowed use of the regions...sort of, as HM lacked funds and had nobles. In reality Arthur asked the regions back multiple times but HM kept stalling the matter, holding on to them (again I know cause I helped in the stalling of it).
And FG felt HM betraying them and acted accordingly. They did not wish to betray their allies. Not sure why that's considered so wrong and foolish.
