Yom Kippur War

The Yom Kippur War, Ramadan War or October War (Hebrew: מלחמת יום הכיפורים; transliterated: Milkhemet Yom HaKipurim or מלחמת יום כיפור Milkhemet Yom Kipur; Arabic: حرب أكتوبر; transliterated: Harb October or حرب تشرين transliterated: Harb Tishrin), also known as the 1973 Arab-Israeli War, was fought from October 6, the holiday of Yom Kippur, to October 26, 1973, between Israel and a coalition of Egypt and Syria.

Summary
The war began with a surprise joint attack by Egypt and Syria into the Sinai and Golan Heights, respectively, which had been captured by Israel six years earlier during the Six-Day War. The Egyptians and Syrians advanced during the first 24–48 hours, after which momentum began to swing in Israel's favor. By the second week of the war, the Syrians had been pushed entirely out of the Golan Heights. In the Sinai to the south, the Israelis had struck at the "hinge" between two invading Egyptian armies, crossed the Suez Canal (where the old cease-fire line had been), and cut off an entire Egyptian army just as a United Nations cease-fire came into effect. The war had far-reaching implications for many nations. The Arab world, which had been humiliated by the lopsided defeat of the Egyptian-Syrian-Jordanian alliance during the Six-Day War, felt psychologically vindicated by its string of victories early in the conflict. This vindication paved the way for the peace process that followed, as well as liberalizations such as Egypt's infitah policy.

Camp David Accords
The Camp David Accords which came soon after the war's end led to normalized relations between Egypt and Israel — the first time any Arab country had recognized the Israeli state. Egypt, which had already been drifting away from the Soviet Union, then left the Soviet sphere of influence almost entirely.