The Six-Day War, fought between Israel and neighboring states Egypt, Syria and Jordan in 1967, was precipitated by Egypt's blockade of the Straits of Tiran. This action, along with Egypt's decision to dismiss UN emergency forces from the Sinai Peninsula, led to Israel's pre-emptive attack on Egypt on June 5.
The war's origins also lay in longer-term issues such as Israel's foundation and its involvement in the Palestinian refugee problem, Israel's invasion of Egypt during the Suez Crisis in 1956 and repeated border clashes throughout the 1960s between Israel and the Arab nations surrounding it. After Egypt received a false tip from the Soviet Union and began a mobilization of military force on Israel's Sinai border, Israel felt compelled to attack Egypt before it was attacked itself. This attack began the brief war.