These amazing colorized photographs bring World War I to life

Trench warfare was one of the hallmarks of World War I.

Soldiers could spend the majority of their deployments in the trenches. Here, a soldier receives a haircut from a barber on the Albanian front.

Here, a German Field Artillery crew poses with its gun at the start of the war in 1914.

Trenches provided no protection against the deployment of chemical weapons. Here, a Canadian soldier poses with his horse while wearing a gas mask at the Canadian Army Veterinary Corps Headquarters.

Fearing a gas attack, Indian infantry soldiers don their masks while taking position in a trench.

Chemical weapons represented a fearsome technological advance on the battlefield. But carrier pigeons, carried by mobile pigeon lofts, were still used to transport messages back to headquarters from the front lines.

World War I was truly a global conflict. These soldiers were members of the 1st Australian Imperial Force, and are pictured here at a military base in their home country.

Soldiers from the Canadian infantry pose with their unit's animal mascot. The pets were a common means of boosting morale in the midst of an unimaginably violent conflict.