Three soldiers and 123 Boko Haram militants were killed when the Islamist group attacked a Chadian army contingent in northern Cameroon, the Chadian military said on Friday.
Twelve soldiers were wounded in the attacks staged by the Islamist group on Thursday and Friday near the border town of Fotokol, according to a military statement read out on national television.
Chad sent a convoy of troops and military vehicles into neighbouring Cameroon on January 17 to deal with the growing threat Boko Haram poses in the region.
"The enemy was repelled by our defensive forces," the general staff's statement said, adding that the troops had "routed" the Islamists in the second attack.
A senior Cameroonian security source said the Chadian troops were deployed to the town, which sits opposite a Nigerian town under Boko Haram control and is also close to the border with Chad, on Wednesday.
Chad has called on countries in the region to form a broad coalition in the fight against the Islamist group. The country has already deployed its army along its borders as well as sending the additional contingent to Cameroon.
The African Union called Friday for a regional five-nation force of 7,500 troops to defeat the "horrendous" rise of Boko Haram.
More than 13,000 people have been killed and more than one million made homeless by Boko Haram violence since 2009.
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