<Ul> <Li> </Li> <Li> </Li> <Li> </Li> </Ul> <P> Following the Declaration of the Establishment of the State of Israel on 14 May 1948, the Arab League decided to intervene on behalf of Palestinian Arabs, marching their forces into former British Palestine, beginning the main phase of the 1948 Arab--Israeli War . The overall fighting, leading to around 15,000 casualties, resulted in cease fire and armistice agreements of 1949, with Israel holding much of the former Mandate territory, Jordan occupying and later annexing the West Bank and Egypt taking over the Gaza Strip, where the All - Palestine Government was declared by the Arab League on 22 September 1948 . </P> <P> Through the 1950s, Jordan and Egypt supported the Palestinian Fedayeen militants' cross-border attacks into Israel, while Israel carried out reprisal operations in the host countries . The 1956 Suez Crisis resulted in a short - term Israeli occupation of the Gaza Strip and exile of the All - Palestine Government, which was later restored with Israeli withdrawal . The All - Palestine Government was completely abandoned by Egypt in 1959 and was officially merged into the United Arab Republic, to the detriment of the Palestinian national movement . Gaza Strip then was put under the authority of Egyptian military administrator, making it a de facto military occupation . In 1964, however, a new organization, the Palestine Liberation Organization (PLO), was established by Yasser Arafat . It immediately won the support of most Arab League governments and was granted a seat in the Arab League . </P> <P> The 1967 Six - Day War exerted a significant effect upon Palestinian nationalism, as Israel gained military control of the West Bank from Jordan and the Gaza Strip from Egypt . Consequently, the PLO was unable to establish any control on the ground and established its headquarters in Jordan, home to hundreds of thousands of Palestinians, and supported the Jordanian army during the War of Attrition, most notably the Battle of Karameh . However, the Palestinian base in Jordan collapsed with the Jordanian--Palestinian civil war in 1970 . The PLO defeat by the Jordanians caused most of the Palestinian militants to relocate to South Lebanon, where they soon took over large areas, creating the so - called "Fatahland". </P>

Who was involved in the palestinian israeli conflict