I don't know about Murdoch MacLean, but the nurse Edith Cavell is well-known. I'd be interested in learning a song about her (especially while we are commemorating ww1 centernary) Imperial War Museum page re Cavell

http://www.telegraph.co.uk/news/bbc/11861398/Revealed-New-evidence-that-executed-wartime-nurse-Edith-Cavells-network-was-spying.html