Israeli forces battled Hezbollah guerrillas Tuesday across southern Lebanon as diplomats at the United Nations struggled to keep a peace plan from collapsing over Arab demands for an immediate Israeli withdrawal. Military planners in Jerusalem said they will push even deeper into Lebanon to target rocket sites. Attempts to draw a cease-fire blueprint came down to a test between a step-by-step proposal backed by Washington and Lebanon’s insistence — supported by Arab allies — that nothing can happen before Israeli soldiers leave. In New York, Arab envoys and U.N. Security Council members tried to hammer out a compromise. Full Story