During WWI, Britain developed the tank as a safer way to pound through German defensive lines. In 1915, a prototype of the Mark I was produced and tested. It was nicknamed "Little Willie." Topping out at around 3 mph and never used in combat, Britain's earliest tank paved the way for further development of the Mark I series and all modern tanks that continue to dominate ground assaults today! "Little Willie" was preserved after the war and history's first and oldest tank can be seen at Bovington Tank Museum in Dorset, South West England.