She could place no confidence in the feudal levies that gathered when the royal standard was raised.

The Hamiltons merely looked to their own advancement; Lord James Stewart was bound to the Congregation; Huntly was a double dealer and was remote; the minor noblesse and the armed burghers, with Glencairn representing the south-west, Lollard from of old, were attached to Knox's doctrines, while the mob would flock in to destroy and plunder.
[Bridal medal of Mary Stuart and the Dauphin, 1558: knox3.jpg] Meanwhile Mary of Guise was at Stirling, and a multitude of Protestants were at Perth, where the Reformation had just made its entry, and had secured a walled city, a thing unique in Scotland.

The gentry of Angus and the people of Dundee, at Perth, were now anxious to make a "demonstration" (unarmed, says Knox) at Stirling, if the preachers obeyed the summons to go thither, on May 10.

Their strategy was excellent, whether carefully premeditated or not.
The Regent, according to Knox, amused Erskine of Dun with promises of "taking some better order" till the day of May 10 arrived, when, the preachers and their backers having been deluded into remaining at Perth instead of "demonstrating" at Stirling, she outlawed the preachers and fined their sureties ("assisters").

She did not outlaw the sureties.