The 1958 Lebanon crisis was a Lebanese political crisis caused by political and religious tensions in the country that included a U.S. military intervention. The intervention lasted around three months until President Camille Chamoun, who had requested the assistance, completed his term as president of Lebanon. American and Lebanese government forces successfully occupied the port and international airport of Beirut. The crisis over, the United States withdrew shortly after.
Lebanese Muslims pushed the government to join the newly created United Arab Republic, while the Christians wanted to keep Lebanon aligned with Western powers. A Muslim rebellion that was allegedly supplied with arms by the UAR through Syria caused President Chamoun to complain to the United Nations Security Council. The United Nations sent a group of inspectors that reported that it didn't find any evidence of significant intervention from the UAR.
The President of the United States, Eisenhower responded by authorizing Operation Blue Bat on July 15, 1958. This was the first application of the Eisenhower Doctrine under which the U.S. announced that it would intervene to protect regimes it considered threatened by international communism. The goal of the operation was to bolster the pro-Western Lebanese government of President Camille Chamoun against internal opposition and threats from Syria and Egypt. The plan was to occupy and secure the Beirut International Airport, a few miles south of the city, then to secure the port of Beirut and approaches to the city.
The chain of command for Operation Blue Bat was as follows: the Eisenhower administration at the strategic level; Specified Command, Middle East (SPECCOMME, a 'double-hat' for Commander in Chief, U.S. Naval Forces, Eastern Atlantic and Mediterranean) at the operational level; the Sixth Fleet, with aircraft carriers Saratoga, Essex, and Wasp, cruisers Des Moines and USS Boston, and two squadrons of destroyers. At the end of June Essex and Boston were anchored at Piraeus, Greece, while Des Moines, from which Vice Admiral Charles R. Brown was flying his flag, was at Villefranche-sur-Mer. Land forces included the 2nd Provisional Marine Force (Task Force 62) and the Army Task Force 201 at the tactical level. Each of these three components influenced Operations Plan 215-58 and its execution.
President Eisenhower sent diplomat Robert D. Murphy to Lebanon as his personal representative. Murphy played a significant role in convincing both sides of the conflict to reach a compromise by electing moderate Christian general Fuad Chehab as incoming President, while allowing Chamoun to continue in power until the end of his term on September 22.
^Scott Jackman, Political Success in War: A Criterion for Success, DTIC
^For more on the naval and Marine Corps forces involved, see Thomas A. Bryson, 'Tars, Turks, and Tankers: The Role of the United States Navy in the Middle East,' Scarecrow Press, Inc., Metuchen, NJ, and London, 1980, 126-140.