From late 1914 a small number of middle-ranking British Army officers tried to persuade the War Office and the Government to consider the creation of armoured vehicles. Amongst their suggestions was the use of caterpillar tractors, but although the Army used many such vehicles for towing heavy guns, it could not be persuaded that they could be adapted as armoured vehicles. The consequence was that early tank development in Great Britain was carried out by the Royal Navy.
As the result of an approach by Royal Naval Air Service officers who had been operating armoured cars on the Western Front, the First Lord of the Admiralty, Winston Churchill formed the Landships Committee, on 20 February 1915. The Director of Naval Construction for the Royal Navy, Eustace Tennyson d'Eyncourt, was appointed to head the Committee in view of his experience with the engineering methods it was felt might be required; the two other members were naval officers, and a number of industrialists were engaged as consultants. So many played a part in its long and complicated development that it is not possible to name any individual as the sole inventor of the tank, though the British Government later made proportionate cash awards to those it considered to have contributed.
Their first design, Little Willie, ran for the first time in September 1915 and served to develop the form of the track but an improved design, better able to cross trenches, swiftly followed and in January 1916 the prototype, nicknamed "Mother", was adopted as the design for future tanks. Production models of "Male" tanks (armed with naval cannon and machine guns) and "Females" (carrying only machine-guns) would go on to fight in history's first tank action at the Somme in September 1916.
The first tank to engage in battle was designated D1, a British Mark I Male, during the Battle of Flers-Courcelette (part of the wider Somme offensive) on 15 September 1916. The performance of the tanks was patchy. Of the 49 ordered only 32 were able to reach their assigned start positions on the battlefield and of them, seven failed to start - leaving 25 moving forward at the commencement of the attack. In the end, the tanks proved to be largely a psychological asset, emboldening the attackers and intimidating the defenders where they moved forward. Tactically however, they provided little advantage or support to the attackers with most breaking down or becoming immobilized in the terrain of the battlefield and only nine actually reaching and penetrating the German lines. Even where they were successful they were hard pressed to advance across the cratered battlefield faster than a soldier's walking pace.
When Winston Churchill, formerly head of the Landships Committee but now a backbench MP, heard of the tanks use and performance at Flers-Courcelette he responded: "This priceless conception, containing if used in its integrity and on a sufficient scale, the certainty of a great and brilliant victory, was revealed to the Germans for the mere petty purpose of taking a few ruined villages". The flaws that were exposed in the designs of the Mark I at Flers–Courcelette led to design improvements and the development of better tactics, which made the tank a formidable weapon by the war's end.