Some thoughts:

"Katy Dear" (not in DT, surprisingly enough)
About a guy and girl who kill themselves because they do not
have permission to marry - good cheery stuff!
"Banks of the Condamine" (in the DT, also surprisingly)
Australian song about shearer who is going shearing, and his
girl who also wants to go.
Forerunners of the above, like "The Cruel War is Raging"
(not in DT, at least not under that title) - similar story.

Happy singing
Shimbo