Isn't that song about a guy getting his legs blown off at Gallipoli?
It's a beautiful tune but if I end up deploying and someone plays a song like that for me (like one of our songs about a "mother and a gold star in the window") I will feel tempted to smack them despite any good intentions.
But if it gives the Aussies courage, more power to them.
I don't know which song you may be referring to, but Waltzing Matilda has nothing at all to do with the battle at Gallipoli. Waltzing Matilda was actually written sometime in the 1890's. The battle at Gallipoli took place in 1914 or 1915.
No, it's not. It is the "Other National Anthem" of Australia (sort of like America the Beautiful is for the US) and was written in 1895, well before Gallipoli and even before the Boer War, which the author covered as a war correspondent.