An alliance with the Emperor facilitated the French invasion. English army confined itself to Calais, capturing Montreuil unsuccessfully but captured Boulogne due to lack of strategic objectives. The Emperor had made seperate peace with France. Francis I sent troops to Scotland to reinforce a possible invasion of England from across the Scottish border. The English were defeated at the Battle of Ancrum Moor. Both sides settled for peace in 1546 as neither could afford the price of conflict. Henry was unable to fund war from extraordinary revenue and had to sell much of the Crown estate, borrowed large sums, and debased the coinage therefore significantly increasing the rate of inflation.