24 November 1914

The information on Duncan Campbell appears to be inaccurate, as the battalion was at the Aisne in September 1914. On 16 October 1914, the 2nd Seaforths were near Armentieres, 100 miles to the north.
Private Campbell was wounded in action but succumbed to his injuries after transfer to hospital in England. 

I do not have access to his service record at present.

Private DUNCAN CAMPBELL
Last address in Lewis: 6 Broker,
Son of Donald Campbell, of Kirkland Lake, Ontario, Canada; husband of Christina Campbell, of 6, Broker
Service unit: 2nd Seaforth Highlanders
Service number: 3/6788
Date of death: 24 November 1914 at the age of 22
Died of wounds sustained at Aisne on 16 October 1914
Interred: Norwich Cemetery, Norfolk, grave 26. 321
Local memorial: Point (Garrabost)
Was the first from the district [Aird, Point] to fall