The Second Siege of Boulogne was an engagement late in the Italian War of 1542-1546. The Dauphin's army descended on Montreuil, forcing Norfolk to raise the siege; Henry himself left for England at the end of September 1544, ordering Norfolk and Suffolk to defend Boulogne.1 The two dukes quickly proceeded to disobey this order; leaving some 4,000 men to defend the captured city, they withdrew the rest of the English army to Calais.2 The English army, outnumbered, was now trapped in Calais; the Dauphin, left unopposed, concentrated his efforts on investing Boulogne.3 On 9 October, a French assault nearly captured the city, but was beaten back when the troops prematurely turned to looting.4
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Phillips, Gervase. "Testing the 'Mystery of the English'". MHQ: The Quarterly Journal of Military History 19, no. 3 (Spring 2007): 44–54. ISSN1040-5992.
Scarisbrick, J. J. Henry VIII. London: The Folio Society, 2004.