 Thomas of Lancaster made little use of his new castle; the only time he might have visited it was in 1319, when he was on his way north to join Edward's military campaign against Scotland.Civil war then broke out in 1321 between Edward and his enemies among the barons.After the initial royalist successes, Thomas fled the south of England for Dunstanburgh in 1322, but was intercepted en route by Sir Andrew Harclay, resulting in the Battle of Boroughbridge, in which Thomas was captured; he was later executed.