The 1982 Israeli invasion of Lebanon resulted in the Palestine Liberation Organization's (PLO) departure from Lebanon. The following creation of Security Zone in South Lebanon has benefited Israeli allies in Lebanon and civilian Israeli population, as Galilee suffered less violent attacks by Hezbollah, than previously by PLO in the 1970s (hundreds of Israeli civilian casualties). Despite this Israeli success in eradicating PLO bases and partial withdraw in 1985, the Israeli invasion had actually increased the severity of conflict with local Lebanese militias and resulted in the consolidation of several local Shia Muslim movements in Lebanon, including Hezbollah and Amal, from a previously unorganized guerrilla movement in the south. Over the years, military casualties of both sides grew higher, as both parties used more modern weaponry, and Hezbollah progressed in its tactics.