The Lewis Gun, a light machine gun, was developed in the United States in 1911. At 12 kg it was far lighter than the Vickers Machine-Gun and in 1915 the British Army decided to purchase the gun for use on the Western Front. Another advantage of the Lewis is that six of these guns could be made in the time taken to produce one Vickers gun. Although too heavy for efficient portable use, it became the standard support weapon for the British infantry during the First World War.