Jordan signed a military pact with Egypt just before Israel launched a preemptive strike on Egypt to begin the Six-Day War in June 1967, where Jordan and Syria joined the war. The Arab states were defeated and Jordan lost control of the West Bank to Israel. The War of Attrition with Israel followed, which included the 1968 Battle of Karameh where the combined forces of the Jordanian Armed Forces and the Palestine Liberation Organization (PLO) repelled an Israeli attack on the Karameh camp on the Jordanian border with the West Bank. Despite the fact that the Palestinians had limited involvement against the Israeli forces, the events at Karameh gained wide recognition and acclaim in the Arab world. As a result, the time period following the battle witnessed an upsurge of support for Palestinian paramilitary elements (the fedayeen) within Jordan from other Arab countries. The fedayeen activities soon became a threat to Jordan's rule of law. In September 1970, the Jordanian army targeted the ''fedayeen'' and the resultant fighting led to the expulsion of Palestinian fighters from various PLO groups into Lebanon, in a conflict that became known as Black September.