Meanwhile, owing to the Huguenot disturbances in France (such as the Tumult of Amboise, directed against the lives of Mary's uncles the Cardinal and Duc de Guise), Mary and Francis could not help the Regent, and Huntly, a Catholic, presently, as if in fear of the western clans, joined the Congregation. Mary of Guise had found the great northern chief treacherous, and had disgraced him, and untrustworthy he continued to be. On May 7 the garrison of Leith defeated with heavy loss an Anglo- Scottish attack on the walls; but on June 16 the Regent made a good end, in peace with all men. She saw Chatelherault, James Stewart, and the Earl Marischal; she listened patiently to the preacher Willock; she bade farewell to all, and died, a notable woman, crushed by an impossible task. The garrison of Leith, meanwhile, was starving on rats and horseflesh: negotiations began, and ended in the Treaty of Edinburgh (July 6, 1560). This Treaty, as between Mary, Queen of France and Scotland, on one hand, and England on the other, was never ratified by Mary Stuart: she appears to have thought that one clause implied her abandonment of all her claims to the English succession, typified by her quartering of the Royal English arms on her own shield. Thus there never was nor could be amity between her and her sister and her foe, Elizabeth, who was justly aggrieved by her assumption of the English arms, while Elizabeth quartered the arms of France. Again, the ratification of the Treaty as regarded Mary's rebels depended on their fulfilling certain clauses which, in fact, they instantly violated.