Chadian troops in Nigeria say they have killed over 200 militants with Boko Haram.
The troops, who entered Nigeria on Tuesday to fight Boko Haram, are fighting for control of Gamboru, a town on the border with Cameroon.
The army said it had recaptured the town, but gunfire was still heard in the town on Wednesday AFP reported.
Chad and Nigeria are also bombing the vast Sambisa forest, where Boko Haram is believed to have bases.
Nigeria is under pressure to regain territory from the militants ahead of the presidential elections in two weeks. Boko Haram meanwhile has stepped up attacks in the northeast of the country.
Chadian troops enter Nigeria to combat Boko Haram militants (03 February 2015)