Tank
In the autumn of 1914, Lieutenant-Colonel E.D. Swinton suggested the idea of an armoured vehicle to the military authorities at home. It was not until January 1915 when Winston Churchill, then the First Lord of the Admiralty, interested himself in Col. Swinton’s suggestion and the idea of a “land battleship” began to take official form.
The first experimental machine was completed in December 1915 and in March 1916 the headquarters of what was to be known as the Heavy Section Machine Gun Corps was established at Bisley under the command of Col. Swinton. Later this section was moved to Elveden Camp, where six companies of tanks were raised.
Tanks were used for the first time in action on the battlefield of the Somme on 15 September 1916. 36 Mark 1 tanks of C and D Companies arrived on the start line for the renewal of the Somme offensive: this action was later designated as the Battle of Flers-Courcelette. Arguments continue as to whether it would have been better to wait until much larger numbers of tanks were available before they were used in battle. The Heavy Section MGC was redesignated as the Heavy Branch MGC in November 1916. CREDIT: LongTail.co.uk
In WW2 all cavalry regiments were equipped with tanks - so were some infantry battalions - especially the Guards.