The Islamic State group has claimed responsibility for the attack on the Nigerian military, saying that it killed 118 people in West Africa province.
No other details were given but the claim follows recent attacks on army bases in Borno state, northeast Nigeria, which has been the epicentre of the deadly nine-year conflict.
Unconfirmed sources said at least 44 soldiers were killed in an attack in Metele village, near the border with Niger, on Sunday, although one soldier who escaped gave a higher toll.
The soldier who decline to be mention said: “The truth is we lost more than 100 men because we were quickly routed,” he said on condition of anonymity from the Borno state capital, Maiduguri, on Friday.
“We were outgunned, so we tried to fight. We realised it was unrealistic so we decided to leave.”
The Islamist militant group said in a video posted online late on Thursday that it conducted five operations in Chad and Nigeria between November 15 and 21, according to the SITE Intelligence Group, which monitors jihadist activity.
Most of the soldiers were killed as the trucks they were in tried to crash through a perimeter fence at the base but got stuck. Senior officers were among the dead, he added.