The Regent was not slow to follow up her advantage. She took possession of the capital two days after the Congregation had quitted it, and she tried hard, but in vain, to persuade the earl Marischal to surrender the castle. The arrival of fresh reënforcements from France at the beginning of December enabled her to abandon her defensive policy and to take decisive measures for the suppression of revolt. On Christmas Day, while the Protestant lords were in council at Stirling, two detachments of her troops, commanded by D'Oysel, drove them precipitately from the town. Pursuing his advantage, D'Oysel despatched his troops across Stirling bridge into Fife, and he himself with another detachment crossed from Leith, apparently with the object of gaining possession of St. Andrew's. The task proved a hard one. At every step he was beset by the Scots under Argyle and the lord James. "The said Earl and Lord James," says Knox, "for twenty-one days they lay in their clothes; their boots never came off; they had skirmishing almost every day; yea, some days, from morn to even." Yet, in the teeth of all obstacles, D'Oysel steadily forced his way to within six miles of St. Andrew's, where Knox and his friends had all but abandoned hope. But unexpected deliverance was at hand. On January 23, 1560, a fleet of strange vessels appeared at the mouth of the Frith of Forth. As a French fleet had been expected for some weeks, D'Oysel concluded that his armament had come at last. He was soon undeceived. Under his eyes the strangers seized two ships bearing provisions from Leith to his own camp. The strange vessels were an advanced squadron of a fleet sent by Elizabeth to block the Frith of Forth against further succors from France. It was now D'Oysel who was in extremities; and before he found himself safe in Linlithgow he had vivid experience at once of the rigors of a Scotch winter and of the savage hate which his countrymen had come to inspire in the nation which for three centuries had called them friends and allies.
Meanwhile, the mission of Maitland to the English court was about to lead to one of the most notable compacts in the national history. At Berwick-on-Tweed, the lord James Stewart, Lord Ruthven, and three other Scottish commissioners met the Duke of Norfolk and concluded a treaty (February 27th) which was to insure the eventual triumph of the Congregation, to make Scotland a Protestant country, and at a later day a constituent part of a Greater Britain. The treaty was in effect a bond of mutual defence against France--Elizabeth having reluctantly consented that an English army should at once enter Scotland and assist the Congregation in driving the French soldiery out of the country. While her revolted subjects were thus making strong their hands against her, fortune was otherwise deserting the cause of the Regent. A great French armament, which was to have brought over a force sufficient to crush all opposition, had been driven back by a succession of storms; and she herself was already stricken with the disease which was soon to carry her off. In these circumstances there was but one course open to her--to fall back on the policy of self-defence and patient waiting on events. After one somewhat wanton expedition against Glasgow and the Hamiltons, her troops finally (March 29th) retired within the fortifications of Leith, and she herself at her special request was received into the castle of Edinburgh.