'June 27th 1918: "3 day Fever"'

Pencil drawing by Sergeant Ernest Blaikley (1885-1965), 28th Battalion, London Regiment (Artists' Rifles), 1917 (c); inscribed on reverse, 'Sgt Mackay, laid up with trench fever. Linghem'.

Blaikley served as a Sergeant Instructor at the First Army School of Scouting, Observation and Sniping at Linghem.

Sergeant Mackay sitting up in bed, resting his head on his left arm, studying a document or map with his tam o'shanter and equipment at the end of his bed.

'Trench Fever' was transmitted by body lice which infested the armies of World War One. As well as a fever, victims could suffer from headaches and muscle pain in the legs and back.

The 28th County of London Battalion (Artist's Rifles) of the London Regiment was formed in 1908 as part of the Territorial Force. Its predecessor unit, the 38th Middlesex Rifle Volunteer Corps, formed in the 1860 had included artists, actors and musicians, which led to the adoption of the title 'Artists' Rifles'.

With the outbreak of World War One (1914-1918) and mobilisation, the unit expanded greatly with the formation of three sub-battalions. The 1/28th County of London Battalion (Artist's Rifles) deployed to France in October 1914 and became an Officer Training Corps. It was followed by the 2/28th in November 1915 which was absorbed into 1/28th. 3/28th remained in England, renumbered as 2/28th, also acting as an officer training unit. The Artists' Rifles produced thousands of officers who went on to serve across the Army.

Ernest Blaikley, an accomplished artist who worked for 'Punch' and 'The Scout' magazines, served with 2/28th Battalion, London Regiment (Artists' Rifles) during World War One. He worked with Major H Hesketh-Prichard at the First Army School of Scouting, Observation and Sniping, established at Linghem in the Pas de Calais in August 1916.

Hesketh-Prichard championed the use of snipers to save lives, improve morale in allied units and to demoralise the enemy by inflicting casualties, instilling fear, and restricting enemy actions such as artillery spotting. The damage well-organised and trained sniper teams could cause was disproportionate to their numbers. In addition, intelligence gained from teams that were constantly observing the enemy was a relatively untapped resource.

Blaikley illustrated Hesketh-Prichard's book 'Sniping in France' which was published in 1920. Before the War Blaikley had attended the Central School of Arts and Crafts in London and he was a founding member of the Society of Graphic Artists in 1920. Blaikley went on to become the Imperial War Museum's first Keeper of Art.