After the Israeli government decided to go to war, planning a preemptive strike to destroy the Egyptian Air Force followed by a ground offensive, Defense Minister Moshe Dayan told Ben-Gurion of the impending attack on the night of 4-5 June. Ben-Gurion subsequently wrote in his diary that he was troubled by Israel's impending offensive. On 5 June, the Six-Day War began with Operation Focus, an Israeli air attack that decimated the Egyptian air force. Israel then captured the Sinai Peninsula and Gaza Strip from Egypt, the West Bank, including East Jerusalem from Jordan, and the Golan Heights from Syria in a series of campaigns. Following the war, Ben-Gurion was in favour of returning all the captured territories apart from East Jerusalem, the Golan Heights and Mount Hebron as part of a peace agreement.