This is getting confusing - The strong walls of Derry might be The high walls of Derry as to be found in Robin Morton: Folksongs sung in Ulster or the version sung by Paddy Tunney as "Johnny, lovely Johnny" but there is no connection between Bonny Portmore and "The high walls of Derry" - I think I shall have to stir myself to type out the Portmore text in Sam Henry's papers - very much longer than anything otherwise available