In the build up to the D-Day invasion, the buildings were both requisitioned to serve as US Army barracks, housing many American soldiers who were stationed in Wales at the time.
Yn y cyfnod cyn ymosodiad D-Day, defnyddiwyd yr adeiladau fel barics Byddin yr UD, gan gartrefu llawer o filwyr Americanaidd a oedd wedi'u lleoli yng Nghymru ar y pryd.