The Lords appealed for help from England and Mary from France. English agents managed the safe return of Earl of Arran, the eldest son and heir of Chatelherault, allowing him to accept the leadership of the Lords. In October the regent was declared "suspended" and replaced by a "great council of the realm". However, Mary of Guise's forces continued to advance, once again threatening St. Andrews. The situation was transformed by the arrival of the English fleet in the Firth of Forth in January 1560, and the French retreated to the stronghold of Leith near Edinburgh. The English and the Lords agreed further support by the Treaty of Berwick in February 1560 and an English army crossed the border to lay siege to the French in Leith. Mary of Guise fell ill and died in June. With no sign of reinforcements, the French opened negotiations. Under the Treaty of Edinburgh (5 July 1560) both the French and English removed their troops from Scotland, leaving the Protestant Lords in control of the country. The Lords accepted Mary Queen of Scots and her husband, now Francis II of France, as monarchs and were given permission to hold a parliament, although it was not to touch the issue of religion.