By Tom Allard MARAWI CITY, Philippines (Reuters) – More than 160 civilians walked out of the besieged Philippines city of Marawi just after dawn on Saturday, deceiving Islamist fighters they encountered by hiding the identity of the many Christians among them. The audacious exodus came after text message warnings that a major assault by Philippines aircraft and ground troops was imminent in the center of the southern city, where some 250 militants and more than 2,000 civilians remain trapped. “We saved ourselves,” said Norodin Alonto Lucman, a well-known former politician and traditional clan leader who sheltered 71 people, including more than 50 Christians, in his home during the battle that erupted on May 23 in the town of more than 200,000 on the southern island of Mindanao.