Following her humiliation in the Suez Crisis of 1956, Britain granted independence in February 1959 to the Federation of South Arabia, which was formed from the Aden colony and the surrounding protectorates, in order to stabilise the region, which had been dogged by years of unrest fuelled by Arab nationalism and anti-colonialism. Having replaced Cyprus as the base of Middle East Land Forces, Aden was of even greater strategic importance to Britain, maintaining with Far East Land Forces in Singapore its global presence. In 1962 the British government announced that a permanent British garrison would be maintained in Aden. Yet in 1967, the British were forced to withdraw from the colony.