You're probably thinking of Festubert.
There is no other John King Campbell.
There's this John Campbell:
John Campbell b Edinburgh d 18 May 1915 France/Flanders
Enlisted Edinburgh Scots Guards (2nd. Batt.) Regimental Number: 8317
mother:Janet.
is this him?
2nd Battalion, The Scots Guards were based at the Tower of London when war was declared in August 1914. In September they joined 20th Brigade, 7th Division, who were concentrating in the New Forest in Hampshire. The Division landed at Zeebrugge in the first week of October 1914, to assist in the defence of Antwerp, they arrived too late prevent the fall of the city and took up defensive positions at important bridges and junctions to aid in the retreat of the Belgian army. The 7th Division then became the first British Troops to entrench in front of Ypres, suffering extremely heavy losses in the The First Battle of Ypres. By February 1915 the Division had been reinforced to fighting strength and they were in action at The Battle of Neuve Chapelle, The Battle of Aubers and The Battle of Festubert.
his army. no. indicates he joined in 1912.
He went overseas 7/10/14 & so qualified for the 14 (Mons) Star.