The 1539 alliance between Francis and Charles had soured, eventually degenerating into renewed war. With Catherine of Aragon and Anne Boleyn dead, relations between Charles and Henry improved considerably, and Henry concluded a secret alliance with the Emperor and decided to enter the Italian War in favour of his new ally. An invasion of France was planned for 1543. In preparation for it, Henry moved to eliminate the potential threat of Scotland under the youthful James V. The Scots were defeated at Battle of Solway Moss on 24 November 1542, and James died on 15 December. Henry now hoped to unite the crowns of England and Scotland by marrying his son Edward to James' successor, Mary. The Scottish Regent Lord Arran agreed to the marriage in the Treaty of Greenwich on 1 July 1543, but it was rejected by the Parliament of Scotland on 11 December. The result was eight years of war between England and Scotland, a campaign later dubbed "the Rough Wooing". Despite several peace treaties, unrest continued in Scotland until Henry's death.