They walked for hours, raising their hands when they encountered Israeli troops with guns trained on them to display their ID cards — or wave white rags. All around them was the sound of gunfire and the incessant buzzing of drones. Bodies littered rubble-filled streets. For the tens of thousands of Palestinians in the Gaza Strip who have fled the northern part of the enclave where the heaviest fighting has been taking place, evacuating to the south has been a perilous journey, according to at le