Mary of Guise had promised not to leave a French garrison in Perth.

She did leave some Scots in French pay, and on this slim pretext of her treachery, Argyll and James Stewart proclaimed the Regent perfidious, deserted her cause, and joined the crusade against "idolatry." NOTE.
It is far from my purpose to represent Mary of Guise as a kind of stainless Una with a milk-white lamb.

I am apt to believe that she caused to be forged a letter, which she attributed to Arran.

See my 'John Knox and the Reformation,' pp.

280, 281, where the evidence is discussed.