Despite this Israeli success in eradicating PLO bases and its partial withdrawal in 1985 , the Israeli invasion Attack increased Cause_change_of_position_on_a_scale the severity of conflict Hostile_encounter with local Lebanese militias and resulted in Causation the consolidation of several local Shia Muslim movements in Lebanon , including Hezbollah and Amal , from a previously unorganized Destroying guerrilla movement in the south .