The Six Day War was the first major Arab attempt since 1948 to destroy Israel. In November 1966, an Egyptian-Syrian Defense Agreement was signed, encouraging the Syrians to escalate tensions, which reached a climax in the spring of 1967.

May 14: Egypt mobilizes its forces in and around the Suez Canal.

May 16: Egypt moves it forces eastward across the Sinai desert towards the Israeli border, demanding the withdrawal of UN Emergency Force (UNEF) stationed along the frontier.

May 19: The Egyptians expelled the UN Emergency Force (UNEF) from the Gaza Strip and Sinai, and continued pouring its military forces into these areas.

May 22: Egypt closed the Straits of Tiran to Israeli shipping, constituting a casus belli for Israel.

May 24-June 4: Answering the Egyptian call, the governments of Jordan, Iraq, Saudi Arabia, Syria and Lebanon moved their forces toward the Israeli border. Israel mobilized its reserve forces, and launched a diplomatic campaign to win international support for ending the Egyptian blockade of Israeli shipping through the Strait of Tiran.

Reproduced by permission of Israel Ministry of Foreign Affairs, Jerusalem.

http://www.mfa.gov.il/MFA/Facts+About+Israel/Israel+in+Maps/Events+leading+to+the+Six+Day+War-+1967.htm