The Trench Kittens.

The Trench Kittens.

Belgian Carabiniers with a dog drawn machine gun cart, 1914.

Belgian Carabiniers with a dog drawn machine gun cart, 1914.

A Royal Field Artillery 18-pounder battery, 1914 (c).

A Royal Field Artillery 18-pounder battery, 1914 (c).

Dogs with first-aid and stimulants [...], 1915 (c).

Dogs with first-aid and stimulants […], 1915 (c).

'V' Beach, Cape Helles, April 1915.

‘V’ Beach, Cape Helles, April 1915.

Horses picketed on the beach, 1915.

Horses picketed on the beach, 1915.

Chocolate Hill at Suvla Bay, Gallipoli, 1915.

Chocolate Hill at Suvla Bay, Gallipoli, 1915.

Horse-drawn supply carts, 1916 (c).

Horse-drawn supply carts, 1916 (c).

Dead horses, 1916 (c).

Dead horses, 1916 (c).

British transport bringing supplies.

British transport bringing supplies.

A column of 18 Pounder QF Mark 1 guns, 1916 (c).

A column of 18 Pounder QF Mark 1 guns, 1916 (c).

Dogs that are trained to a rigid discipline, 1916 (c).

Dogs that are trained to a rigid discipline, 1916 (c).

18th King George's Own Lancers, on the Somme, 15 July 1916.

18th King George’s Own Lancers, on the Somme, 15 July 1916.

Cardinal Bourne visits Irish troops at the Front, 1916 (c).

Cardinal Bourne visits Irish troops at the Front, 1916 (c).

Hauling a 60-pounder on the Somme, October 1916.

Hauling a 60-pounder on the Somme, October 1916.

German prisoners at Dernancourt, 15 September 1916.

German prisoners at Dernancourt, 15 September 1916.

Transport difficulties on the Somme front, 16 December 1916.

Transport difficulties on the Somme front, 16 December 1916.

British infantry being driven from the front line for a rest.

British infantry being driven from the front line for a rest.

Drawing rations from the railhead, Ecuires, 28 June 1917.

Drawing rations from the railhead, Ecuires, 28 June 1917.

Horse-drawn water cart stuck in the mud, St. Eloi, 1917.

Horse-drawn water cart stuck in the mud, St. Eloi, 1917.

Ammunition limbers moving up the Ypres-Menin Road, Sept 1917.

Ammunition limbers moving up the Ypres-Menin Road, Sept 1917.

Our cavalry pursue the defeated enemy ...', 9 August 1918.

Our cavalry pursue the defeated enemy …’, 9 August 1918.

Indian cavalry await the order to advance on the Somme, 1916.

Indian cavalry await the order to advance on the Somme, 1916.

Horse-drawn water cart stuck in the mud, St. Eloi, 1917.

Horse-drawn water cart stuck in the mud, St. Eloi, 1917.

New Zealand troops loading ammunition limbers, Sept 1918.

New Zealand troops loading ammunition limbers, Sept 1918.

Horse Drawn Ambulances.

Horse Drawn Ambulances.

Animal usage on the front lines