By June 1982, when the IDF went into Lebanon, the PLO had made life in northern Israel intolerable, by its repeated shelling of Israeli towns.
A force of some 15-18,000 PLO members was encamped in scores of locations in Lebanon. About 5,000-6,000 were foreign mercenaries, coming from such countries as Libya, Iraq, India, Sri Lanka, Chad and Mozambique.1 Israel discovered enough light arms and other weapons in Lebanon to equip five brigades.2 The PLO had an arsenal that included mortars, Katyusha rockets, and an extensive anti-aircraft network. The PLO also brought hundreds of T-34 tanks into the area.3 Syria, which permitted Lebanon to become a haven for the PLO and other terrorist groups, brought surface-to-air missiles into that country, creating yet another danger for Israel.
Israeli strikes and commando raids had been unable to stem the growth of this PLO army. Israel was not prepared to wait for more deadly attacks to be launched against its civilian population before acting against the terrorists.
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