Passage: After the Battle of Towton, Henry VI and Margaret had fled to Scotland, where they stayed with the court of James III and followed through on their promise to cede Berwick to Scotland. Later in the year, they mounted an attack on Carlisle, but, lacking money, they were easily repulsed by Edward's men, who were rooting out the remaining Lancastrian forces in the northern counties. Several castles under Lancastrian commanders held out for years: Dunstanburgh, Alnwick (the Percy family seat), and Bamburgh were some of the last to fall.

Question: What are some of the castles who were the last to fall to Lancastrian forces?
Dunstanburgh, Alnwick (the Percy family seat), and Bamburgh