Landed 10.8.1914 so either a Regular Soldier or possibly a Territorial.
He would not have been a Territorial, but he may have been a Reserve - men signed up for 12 years service, but only the first 7 (mainly) were served in uniform after which they went back to civilian life but remained on call for duty as members of the Reserve until the full 12 years were up.
2nd Battalion, Argyll & Sutherland Highlanders was a Regular battalion stationed at Fort George (near Inverness). When was was declared it was brought up to full strength using recalled Reserves and shipped to France where it was attached to the 19th Brigade - a slightly odd unit independent of Division or Corps until October, when 6th Division / 3 Corps arrived and took it in.
On 26 August 1915 the battalion was in the line manning Orchard Trench, which seems to have been at the edge of Givenchy village. The battalion's war diary (£3.50 as a TNA download, or at Ancestry) state that casualties that day were 2 killed and 7 wounded - its first casualties for a couple of weeks, so he was probably one of the 2 killed.
He was buried in the King's Liverpool Graveyard at Cuinchy - his remains were moved to their current location in 1924 (documentation available from his CWGC entry).
