Marco,
While some of the accounts (and some of your description, like "both legs nearly severed...") may contain a bit of hyperbole, Barker did find himself in a singlehanded fight against several DVII's (estimates vary from 15 to 60), was seriously wounded, possibly downed up to 4 of his attackers, and somehow survived. He was awarded the Victoria Cross for this fight.
While this exploit (as well as much of what is discussed here) may not be known to most people, Barker IS discussed here, and admired by many Forumites - he just may not have been mentioned recently. Check out the Forum Archives.
If you'd really like to learn more about
William Barker, I suggest you read "Barker VC" by Wayne Ralph. It is available in paperback from Amazon.com, and I believe it is reviewed on this site. Aside from this legendary fight, Barker was one of the best fliers and leaders in the war, and one of Canada's greatest heroes.
Rich