The siege of Boulogne took place during the autumn of 1492. Henry VII of England had led an expeditionary force of 12,000 troops across the Channel to Calais and began to besiege the French port of Boulogne on 18 October. After several weeks the siege was broken off when Henry and the French monarch Charles VIII agreed to the Peace of Étaples. The siege had proved to be a successful show of force and Henry was offered very favourable terms by Charles, including the end of French support to the pretender to the English throne Perkin Warbeck,[1] Warbeck was also expelled from the country. The terms of the treaty also included the English accepting French control of Brittany, and the French paying Henry an indemnity of 742,000 crowns, payable at 50,000 crowns per annum, equivalent to 5% of the crown's annual income.[2] Henry had been in negotiations even before the campaign, and the move against Boulogne may have been intended to put further pressure on Charles.