It was in a lyrics add request a few years ago, but never made it to the DT. And the search is buggered at the moment, it just comes up with irrelevancies.
I recall the song being very popular in West Cork back in the 70s. I assume it refers to the WWI Salonika campaign to assist Serbia. Casualties from battle were light (for WWI), but many died of disease, including most famously, the poet Rupert Brooke.
The song was apparently performed by the Dubliners, though I don't remember it- they were thought a little below the salt back then in our circles. No doubt they claim they wrote it too.