In 1973 Egypt joined Syria in a war on Israel to regain the territories lost in 1967. The two Arab states struck unexpectedly on October 6, which fell on Yom Kippur , Israel's holiest fast day .

After crossing the swise channel the Arab forces gain a lot of advanced positions in Sinai Peninsula and Golan Heights and manage to defeat the Israeli forces for more then three weeks.

Israeli forces with a massive U.S. economic and military assistance managed to stop the arab forces after a three-week struggle and defeat with the cost of many casualties,and the Arabs strong showing won them support from the Union of Soviet Socialist Republics (USSR) and most of the world's developing countries.

Israel, forced to compete with the nearly unlimited Arab resources, was faced with a serious financial setback. Only massive U.S. economic and military assistance enabled it to redress the balance, but even American aid was unable to prevent a downward spiral of the economy.

In an effort to encourage a peace settlement, U.S. President Richard M. Nixon charged his secretary of state, Henry Kissinger, with the task of negotiating agreements between Israel and Egypt and Syria. Kissinger managed to work out military disengagements between Israel and Egypt in the Sinai and between Israel and Syria in the Golan Heights during 1974.