This title explores the conception and design of a range of enormous and powerful tanks that came to be designated as 'super-heavy'. The fascinating super-heavy tanks of World War II were heirs to the siege machine tradition - a means of breaking the deadlock of ground combat. As a class of fighting vehicle, they began with the World War I concept of the search for a "breakthrough" tank, designed to cross enemy lines. It is not surprising that the breakthrough tank projects of the period prior to World War II took place in the armies that suffered the most casualties of the Great War...

Designed in the 1950s, the US Marines' M50 Ontos and the US Army's M56 Scorpion were both intended to be fast, light, air-droppable tank-killers for the Cold War battlefield--an answer to the cumbersome and ineffective World War II-vintage tanks that had taken to the battlefield during the Korean War. Although they shared the aim of bringing light, mobile, and lethal antitank firepower to the infantry, the two vehicles varied wildly in design to cater for their unique mission demands. They first saw service in the Lebanon intervention of 1958 but it was in the Vietnam War that they made...