Highlanders' Territorials

[Dileasgubas]

I have come across an interesting find and was seeking some information.

I recently purchased a sgian dhub on eBay from, as it turns out, a neighbour of the family. The neighbour indicated that the sgian belonged to his grandfather, Alexander Campbell, who was a piper in the First World War. It is a simple antler-handled knife that is obviously old, and if the oral history is correct, it has been "over the top" on more than one occasion.

I managed to to find Alexander Campbell's attestation letter when he joined the Canadian Army on 24 November, 1914. The family confirmed that he was born in Killin, Scotland and this man is the only Alex Campbell on the Army list from Killin so I am fairly sure that I have the right man. Although a mechanic by trade, since he played the pipes I suspect that he was pressed into service as a piper for the duration of the War.

What is interesting is that Campbell mentions on his enrollment form that he has had 12 years of prior service with the "Highlanders' Territorials." This would mean that his sgian likely came from his time in that unit.
I cannot seem to find information on the Territorials. Could anyone enlighten me? Many thanks.