Sir Alexander Buchanan, second son of Walter Buchanan of Buchanan, led men of the clan in support of the French against the English at the Battle of Baugé in 1421. It is said that Sir Alexander Buchanan came face to face with the Duke of Clarence and, escaping his thrust, pierced the Duke through the left eye, killing him. Sir Alexander Buchanan however was later killed leading the clan against the English at the Battle of Verneuil in 1424.