Nigeria's Boko Haram pledged allegiance last week to the self-proclaimed Islamic State, which is fighting for control of the Iraqi city of Tikrit.
The militant Islamist group killed 68 in Njaba, but has suffered setbacks in some areas after Nigeria teamed up with other West African countries to launch air and ground attacks.
Nigeria-based Boko Haram militants attacked neighboring Chad for the first time, killing several civilians in a border town. Chad has targeted the Islamist insurgency as part of a regional coalition.
Militants had stolen arms, ammunition, and armored vehicles during an attack on a multinational military base last month. Their recovery by the Nigerian military marks the latest setback Boko Haram has experienced in recent days.
The attack on Baga, a border town with a Nigerian military base, started on Jan. 3. The Nigeria government disputes claims by human rights groups that as many as 2,000 people, mostly civilians, died in the subsequent fighting.
The killing of 143 militants from the Nigeria-based Islamic extremist group could be a major blow to their expansion strategy. Hundreds of people died during a recent Boko Haram attack on a Nigerian garrison town near the border.
Saturday's attack on the town of Baga is another embarrassing setback for Nigeria's military, which is working with its neighbors to secure the remote border area. Boko Haram militants separately abducted around 40 boys from another village.
Boko Haram militants kidnapped nearly 200 women and children and killed 32 people this week. The government, meanwhile, said 54 soldiers will face a firing squad for mutiny, assault, and disorderly behavior.