Throughout military history, animals have gone to war alongside humans. Millions of horses, mules and donkeys died in World War I, as they carried the soldiers and artillery ammunition to the battle fields of Europe. “There was a great love and loyalty between the soldiers and the animals they worked with,” said registrar Toni M. Kiser, who created the exhibit “Loyal Force: Animals at War” at the National World War II Museum. During World War II, nearly 3,000 horses, provided by the Army Quartermaster Corps, enabled the shore patrol to cover more ground. “The U.S. Coast Guard used more horses than any other branch of the U.S. Military during WWII.” Most supplies and a great deal of artillery were still horse-drawn, and a mounted infantry squadron patrolled about six miles in front of every German infantry division. “These mounted patrol troops were referred to as the ‘eyes and ears of their units.’” The Photos in this post include images from the Civil War to Iraq and Afghanistan. A docile horse wears a gas mask, as a precaution against gas attacks, that was developed by "Our Dumb Friends League," a humane society in London, England, March 27, 1940. The mask might almost be a feed bag, except for the window panes and the enclosed ear muffs. In this photo release by the National Archives via National World War II Museum, Butch, a sentry dog, stands guard over Pfc. Rez P. Hester of the Marine Corps’ 7th War Dog Platoon on Iwo Jima in this undated photograph from the National Archives. The photo will be part of an exhibit, titled "Loyal Force: Animals at War" at the National World War II Museum in New Orleans from July 22-Oct. 17. A Russian man, an evacuee from the Chechen Capital Grozny, reaches out for a final pat of his dog, Jan. 21, 1995. Pets left behind as people flee the war-torn region are forced to fend for themselves. Some 200 people were evacuated from the Grozny area on Saturday, 21 by Russian forces with the Ministry of Emergency Situations. The majority of evacuated were ethnic Russian who had no place to flee during the fighting between Russian and Chechen forces.