Conditions were severe for horses at the front; they were killed by artillery fire, suffered from skin disorders, and were injured by poison gas. Hundreds of thousands of horses died, and many more were treated at veterinary hospitals and sent back to the front. Procuring equine food was a major issue, and Germany lost many horses to starvation through lack of fodder. Several memorials have been erected to commemorate the horses that died. Artists, including Alfred Munnings, extensively documented the work of horses in the war, and horses were featured in war poetry. Novels, plays and documentaries have also featured the horses of World War I.