Israel appears poised to launch a ground incursion into Lebanon, as its army chief Herzi Halevi said on Saturday that his forces were prepared for what was to come and Lebanese residents were told to flee to safety. His comments came after Israel killed Hezbollah leader Hassan Nasrallah and several other senior members of the Lebanese Shiite militia. “Challenging days lie ahead of us,” Halevi said in a video released by the army. The Israeli army was “on high alert, both defensively and offensively, on all fronts,” he said, adding they were prepared for what comes next. The Hezbollah commander…