But that they were _not_ rebels Knox urged in a sermon at Edinburgh, which the Reformers, after devastating Stirling, reached by June 28-29 ( ?), and the Second Book of his "History" labours mainly to prove this point; no change of "authority" is intended.
What Knox wanted is very obvious.

He wanted to prevent Mary Stuart from enjoying her hereditary crown.

She was a woman, as such under the curse of "The First Blast of the Trumpet," and she was an idolatress.
Presently, as we shall see, he shows his hand to Cecil.
Before the Reformers entered Edinburgh Mary of Guise retired to the castle of Dunbar, where she had safe access to the sea.

In Edinburgh Knox says that the poor sacked the monasteries "before our coming." The contemporary Diurnal of Occurrents attributes the feat to Glencairn, Ruthven, Argyll, and the Lord James.

{135a} Knox was chosen minister of Edinburgh, and as soon as they arrived the Lords, according to the "Historie of the Estate of Scotland," sent envoys to the Regent, offering obedience if she would "relax" the preachers, summoned on May 10, "from the horn" and allow them to preach.