The Plantagenet King Edward I spent vast sums of money on fearsome fortresses to subdue the Welsh, but when he turned his attention to Scotland, things did not go so well...

Originally released by BBC Worldwide Learning, 2014. Streaming video file encoded with permission for digital streaming by Infobase on May 22, 2019.

Introduction: Castles - Britain's Fortified History: Kingdom of Conquest (1:57); --White Castle (4:53); -- Dolbadarn Castle (3:16); -- Caernarfon Castle (7:40); -- Building a Castle (5:58); -- Beaumaris Castle (5:46); -- Caerlaverock Castle (5:17); -- Stirling Castle (3:00); -- Operating a Trebuchet (4:40); -- Kildrummy Castle (4:31); -- Future of Castles (2:29); -- Credits: Castles - Britain's Fortified History: Kingdom of Conquest (0:30); .