70,000 troops, 800 tanks and 350 fighter jets invaded Lebanon. Israel claimed its aim was to stop further attacks by destroying PLO bases and establishing a buffer zone of 45km in South Lebanon.
Israel went further than these aims. They rapidly drove north, bombing towns as they went along. 300,000 Lebanese lost their homes and 12,000 were killed.
Israeli forces surrounded Beirut - this was where the PLO headquarters were. They bombed Beirut for 2 months and also cut off food, water and electricity supply for those 2 months. 20,000 innocent Lebanese civilians were killed.
The true aim of Israel was to actually install the leader of the Christian Phalange Party - Bachir Gemayel as president who was pro-Israeli and would be a friendly neighbour to them