One Addition 

Mustafaa, I promised much more stuff but have been too busy lately.
One thing that sticks out and could be fixed quickly is the beginning of the invasion.
Yes, it is my fault for adding only the Argov incident, which now makes it sounds as if it was the main reason for invasion, which is of course wrong. So, the sentence:
 "On 1982-06-06 Israel invaded Lebanon in response to the attempted assassination of Israeli Ambassador Shlomo Argov by Abu Nidal in London on June 4."
should be expanded. This is a quickie list of basic facts:
 Israel had been bombing Lebanon/PLO for months, from the air, sea and land; and preparing for the invasion (see below, they couldn't have pulled of the invasion in a matter of days otherwise.)
 There was the attempted assassination Shlomo Argov ...
 The assassination attempt was used by Begin as an impetus to shortcut the Knesset's debate and move into Lebanon without full approval. 
 Israel invaded with 60,000 troops.

I'll post links and add more explanations if needed. 
 08:56, 2004 Dec 2 (UTC)