In a pre-emptive attack on Egypt on 5 June 1967 that drew Syria and Jordan into a regional war, Israel made massive territorial gains capturing the West Bank, Gaza Strip, Golan Heights and the Sinai Peninsula up to the Suez Canal.The principle of land-for-peace that has formed the basis of Arab-Israeli negotiations is based on Israel giving up land won in the 1967 war in return for peace deals recognising Israeli borders and its right to security. The Sinai Peninsula was returned to Egypt as part of the 1979 peace deal with Israel.