The first Aldermaston March was organised by the CND and took place at Easter 1958, when several thousand people marched for four days from Trafalgar Square, London, to the Atomic Weapons Research Establishment close to Aldermaston in Berkshire, England, to demonstrate their opposition to nuclear weapons.[35][36] The Aldermaston marches continued into the late 1960s when tens of thousands of people took part in the four-day marches.[3] The formation of CND tapped widespread popular fear and opposition to nuclear weapons following the development of the first hydrogen bomb, and in the late 1950s and early 1960s anti-nuclear marches attracted large followings, especially to the annual Aldermaston march at Easter.