It is estimated that 8 million horses died during the four years of war – more than 136,000 of them were from Australia.

Horses were targeted by both sides to weaken their enemies. In particular, the German Navy fired at ships laden with horses and donkeys, which led to thousands of animals dying in the middle of the ocean.

In this photo, a horse is lowered into position to be treated for a gunshot wound in Le Valdahon, Doubs, France.

In this image, WWI soldiers are shown paying homage to their equine partners, courtesy of the Saltburn Animal Rescue Association.