1983 Beirut barracks bombings
On October 23, 1983, two truck bombs were detonated at buildings in Beirut, Lebanon, housing American and French service members of the Multinational Force in Lebanon (MNF), a military peacekeeping operation during the Lebanese Civil War. The attack killed 307 people: 241 U.S. and 58 French military personnel, six civilians and two of the attackers.
Source: Wikipedia — 1983 Beirut barracks bombings (CC BY-SA 4.0)