In August 1914, the French Armed Forces numbered 1,300,000 soldiers. At the beginning of the war, the French Army was wearing the uniform of the Franco-Prussian War of 1870, but the uniform was maladapted to the trenches, and so in 1915 the Army replaced the uniform, with the Adrian helmet replacing the kepi. During WWI the French Armed Forces reached a size of 8,300,000 soldiers, of which about 300,000 came from the colonies. During the war around 1,400,000 soldiers were killed. It was the most deadly conflict in French history.