By a subsequent act of Council, 24th June 1613, death was denounced against any persons of the tribe formerly called MacGregor, who should presume to assemble in greater numbers than four.

Again, by an Act of Parliament, 1617, chap.
26, these laws were continued, and extended to the rising generation, in respect that great numbers of the children of those against whom the acts of Privy Council had been directed, were stated to be then approaching to maturity, who, if permitted to resume the name of their parents, would render the clan as strong as it was before.
The execution of those severe acts was chiefly intrusted in the west to the Earl of Argyle and the powerful clan of Campbell, and to the Earl of Athole and his followers in the more eastern Highlands of Perthshire.

The MacGregors failed not to resist with the most determined courage; and many a valley in the West and North Highlands retains memory of the severe conflicts, in which the proscribed clan sometimes obtained transient advantages, and always sold their lives dearly.

At length the pride of Allaster MacGregor, the chief of the clan, was so much lowered by the sufferings of his people, that he resolved to surrender himself to the Earl of Argyle, with his principal followers, on condition that they should be sent out of Scotland.

If the unfortunate chief's own account be true, he had more reasons than one for expecting some favour from the Earl, who had in secret advised and encouraged him to many of the desperate actions for which he was now called to so severe a reckoning.
But Argyle, as old Birrell expresses himself, kept a Highlandman's promise with them, fulfilling it to the ear, and breaking it to the sense.