When the War of the Camps broke out at Beirut in May 1985, the KDP-L joined an alliance of pro-Arafat Palestinian refugee camp militias, the Al-Mourabitoun, the Communist Action Organization in Lebanon (OCAL), and the Sixth of February Movement ('6th FM') militias against a powerful coalition that gathered their Druze allies of the Progressive Socialist Party (PSP), the Lebanese Communist Party (LCP), and the Shia Muslim Amal movement militia forces backed by Syria,[3] the Lebanese Army, and anti-Arafat dissident Palestinian guerrilla factions.