Syuvla Bay was one of the landing points in the Gallipoli campaign, so it's be WW1 in origin.
Many died thanks to the bungling by commanders, so wives and mothers may well have felt their husbands' and sons' sacrifices were in vain. None the less, there weren't many Aussies there.
"On 15 August, after a week of indecision and inactivity, the British commander at Suvla, Lieutenant-General Sir Frederick Stopford was dismissed. His performance in command is often considered one of the most incompetent feats of generalship of the First World War."
https://en.wikipedia.org/wiki/Landing_at_Suvla_Bay
"A song "Suvla Bay," which is believed to have been written during World War I but first copyrighted and published in 1944, has been recorded by many artists. It tells the story of an Australian girl who receives the news that her sweetheart or husband has been killed at Suvla. However, in a recurring line the song implies that he was killed in April, four months before the Suvla landing. He might have been killed at some point after the April landing at Anzac, but not at Suvla; there was no one there who had "played their part" in April. "