var vtn_player_type = "vp";var ven_video_key="NjE0OTIxfHwxNDcxfHwwfHx8fHx8";var ven_width="660";var ven_height="409";Dozens of Chadian tanks head out of the capital south towards Cameroon to help fight Nigeria's dreaded Boko Haram insurgents. Duration: 01:16
