Palestinians fedayins stand guard near their headquarters in Irbid, in September 1970, during the fights between the Jordanian army and Palestinian Fedayins in the so-called Black September events. In September 1970, King Hussein of Jordan decided to put an end to the Palestinian Liberation Organization's state-within-a-state in Jordan as well as its guerilla attacks on Israeli-occupied Arab territory in the West Bank and ordered the Jordanian military to launch attacks to push the PLO out of Jordan. Armed conflict lasted until July 1971 and caused the dead of thousands of Palestinans and the expulsion of the PLO and thousands of Palestinian fighters to Lebanon. (Photo credit should read -/AFP via Getty Images) Getty ImagesGetty Images