The task of quieting the Englishry of Ulster was intrusted to William Stewart, Viscount Mountjoy.

Mountjoy, a brave soldier, an accomplished scholar, a zealous Protestant, and yet a zealous Tory, was one of the very few members of the Established Church who still held office in Ireland.

He was Master of the Ordnance in that kingdom, and was colonel of a regiment in which an uncommonly large proportion of the Englishry had been suffered to remain.

At Dublin he was the centre of a small circle of learned and ingenious men who had, under his presidency, formed themselves into a Royal Society, the image, on a small scale, of the Royal Society of London.

In Ulster, with which he was peculiarly connected, his name was held in high honour by the colonists, [138] He hastened with his regiment to Londonderry, and was well received there.
For it was known that, though he was firmly attached to hereditary monarchy, he was not less firmly attached to the reformed religion.
The citizens readily permitted him to leave within their walls a small garrison exclusively composed of Protestants, under the command of his lieutenant colonel, Robert Lundy, who took the title of Governor, [139] The news of Mountjoy's visit to Ulster was highly gratifying to the defenders of Enniskillen.