A Scottish army was assembled under the leadership of John, Earl of Buchan, and Archibald, Earl of Wigtown, and from late 1419 to 1421 the Scottish army became the mainstay of the Dauphin’s defence of the lower Loire valley. When Henry returned to England in 1421, he left his heir presumptive, Thomas, Duke of Clarence, in charge of the remaining army. Following the King's instructions, Clarence led 4000 men in raids through the provinces of Anjou and Maine. This chevauchée met with little resistance, and by Good Friday, 21 March, the English army had made camp near the little town of Vieil-Baugé. The Franco-Scots army of about 5000 also arrived in the Vieil-Baugé area to block the English army's progress. There are several accounts of the Battle of Baugé; they may vary in the detail; however, most agree that principal factor in the Franco-Scottish victory was the rashness of the Duke of Clarence. It seems that Clarence did not realise how big the Franco-Scottish army was as he decided to rely on the element of surprise and attack immediately. The battle ended in a major defeat for the English.