The Battle of Piperdean (1436) was an engagement in the Scottish Borders, fought between the Kingdom of Scotland and the Kingdom of England. An English force led by George de Dunbar, 11th Earl of March and Henry Percy, 2nd Earl of Northumberland attempted to take the forfeited Dunbar's Castle of Dunbar, back from William Douglas, 2nd Earl of Angus who as Warden of the Scottish Marches had invested the castle the previous summer. Percy and Dunbar came north with some 4000 men.