On this day in 1958, the U.S. invaded Lebanon with 54,000 troops in the name of anti-communism, occupying the Port of Beirut and Beirut International Airport, its first overt military action in the Middle East.
The pro-Western president of Lebanon, Camille Chamoun, had asked for U.S. assistance after armed groups in Lebanon began rebelling against his administration. While not overtly communist in character, the rebels had burned down a U.S. propaganda outlet and were generally aligned with Gamal Nasser and the United Arab Republic (UAR).
Using the anti-communist "Eisenhower Doctrine" as justification, on July 15th, President Eisenhower authorized "Operation Blue Bat", a military occupation of Lebanon with more than 14,000 footsoldiers, supported by a fleet of 70 ships and 40,000 sailors, to keep Chamoun in power.
Occupying the Port of Beirut and Beirut International Airport, the forces remained in Lebanon until October 25th, when President Chamoun completed his term as president of Lebanon.
According to historian Maurice Labelle, "this was the first overt U.S. military intervention in the region", demonstrating the U.S.'s willingness to act as an imperialist power in the Middle East, willing to commit to overt military action to manage its interests in the region.