Gurkha soldiers resting in a trench at Gallipoli, 1915.

Gurkha soldiers resting in a trench at Gallipoli, 1915.

Indian soldiers in a trench, Gallipoli, 1915.

Indian soldiers in a trench, Gallipoli, 1915.

Anzac in the snow, November 1915.

Anzac in the snow, November 1915.

Gurkha Rifles in bivouacs, 1915.

Gurkha Rifles in bivouacs, 1915.

A Sikh soldier in a sandbagged gun emplacement, 1915.

A Sikh soldier in a sandbagged gun emplacement, 1915.

Using a trench periscope, Gallipoli, 1915.

Using a trench periscope, Gallipoli, 1915.

Indian soldiers in a trench, Gallipoli, 1915.

Indian soldiers in a trench, Gallipoli, 1915.

Troops of 29th Indian Infantry Brigade, Gallipoli, 1915.

Troops of 29th Indian Infantry Brigade, Gallipoli, 1915.

A Benet-Mercier machine gun section, Flanders, 1915.

A Benet-Mercier machine gun section, Flanders, 1915.

Soldiers from the Commonwealth