MAHAMAT RAMADANE  CHAD’S army said yesterday it had beaten back a column of insurgents, claiming to have halted a rebel advance towards the capital N'Djamena as the country awaits the final results of a presidential election last week. The rebel group Front for Change and Concord in Chad (FACT), based in Chad's northern neighbour Libya, has made inroads south since it attacked a border post on election day and called for an end to President Idriss Deby's 30-year rule. Military spokesman Azem Bermendao Agouna told Reuters army troops had killed more than 300 insurgents and captured 150 in the battle…