TEL AVIV, Israel - The Israeli military began preparing to reoccupy southern Lebanon on Thursday, and Israeli officials conceded that their three-week bombing campaign has had no significant impact on Hezbollah's ability to fire short-range rockets into northern Israel. The dispatch of thousands of Israeli soldiers to retake as much as one-fifth of Lebanon - the operation must still be approved by the Israeli Cabinet - would mark a major expansion in Israel's Lebanon campaign and would reverse Israel's withdrawal from Lebanon six years ago after a troubled 18-year occupation. It also would complicate efforts in the United Nations to...