In 1513, with Henry VIII at war in France, Queen Katherine of Aragon ruled England as as its governor for almost five months. A Scottish invasion forced her to raise and army and head for the Midlands. There she prepared to coordinate England’s defence. The English victory at the Battle of Flodden, fought on 9 September 1513 , ended the need for Katherine’s army. Records from the Tudor Chamber Books project provide new evidence of Katherine’s role and the extent of her control of government during this year of crisis.