In the cemetery of my home village are three Commonwealth war graves from the First World War. All three are Canadian, and all died in the last months of the war, two of the young men in the closing days. One served with the Canadian Forestry Corps, which had a large presence on densely-forested Speyside. The Corps provided timber for the Allied war effort, including for trench construction, railways, ammunition crates and road-building. The others served with the Canadian Army Service Corps, which provided logistics support, presumably necessary for the onward transport of the timber.
Towards the end of the war some units were called on to provide infantry. Given that these graves are located on Speyside, I think it's unlikely that the men died in battle. My internet searches so far haven't revealed any further information. Perhaps they died in logging accidents, or in the Spanish flu that swept the world in 1918. The deaths of Private Eby and Private Berthiaume, a day apart in November 1918 came at the peak of the second wave of Spanish flu that year. Unlike other flu viruses, this strain killed healthy young adults with strong immune systems.
Whatever the reasons for their deaths, they are not forgotten. Posies of spring flowers appear on the graves every Easter, and these lovely wreaths every Christmas. I haven't been able to find out yet who does this. The Commonwealth War Graves website doesn't have any information about laying of tributes during the year. Perhaps it's done through the church, or perhaps someone has decided that these young men, far from home, will have their flowers too.