Six soldiers, including two officers, who fought to repel a Boko Haram attack on Wednesday were killed by the insurgents.
One of the victims was a colonel and another a captain.
Several Boko Haram fighters were also killed by the Nigerian soldiers.
The attack occurred at about 6:00 p.m. along Maiduguri-Damaturu Highway during a patrol by the colonel and other soldiers of the 29 Task Force Brigade.
The Nigerian Army has not announced the development.