Chad pulls out all troops from Central Africa Dozens of Chadian tanks headed out of N'Djamena Friday south towards Cameroon to help fight Nigeria's dreaded Boko Haram insurgents. Cameroon's President Paul Biya had announced Thursday that Chad President Idriss Deby had decided to send "a substantial contingent" of troops to help Cameroonian armed forces who have faced repeated attcks from Boko Haram. File images and soundbites of Chad forces in Central Africa