The United Nations appealed for emergency funds for Chad to feed thousands of refugees from regional violence as U.N. chief Ban Ki-moon arrived on Friday to pave the way for international peacekeepers. Most of the 380,000 civilians sheltering in eastern Chad fled civil war at home in Sudan's Darfur region, but 150,000 of them are local people forced from their homes as ethnic conflict has spilled over the border in a regional spiral of bloodshed.