The forces entered Nigeria after residents of Ndaba in Borno state said Boko Haram militants were massing in the hills around the village and planning an attack, said Col. Jacob Kodji.
Several militants were killed in the fighting Thursday and Friday near Ndaba, about 20 kilometers (12 miles) from the Cameroonian border, said Kodji. He would not give an exact number of casualties and did not say whether any Cameroonian forces were killed or wounded. Other militants fled and some may be hiding out in Ndaba, he said.
Cameroonian troops also destroyed some of the militants' vehicles and ammunition, he said.
Boko Haram, which is based in northern Nigeria, has been waging a six-year insurgency to create an Islamic state. Borno state is one of its strongholds.
The militants killed an estimated 10,000 people last year and are blamed for the abduction last April of more than 200 schoolgirls who remain missing.
In response to increasing attacks in Nigeria and in neighboring countries, Cameroon, Chad and others have banded together to fight the extremists.
If you are happy to be contacted by a Daily Trust journalist please leave a telephone
number that we can contact you on. In some cases a selection of your comments will
be published, displaying your name as you provide it and location, unless you state
otherwise. Your contact details will never be published. When sending us pictures,
video or eyewitness accounts at no time should you endanger yourself or others,
take any unnecessary risks or infringe any laws. Please ensure you have read the
terms and conditions.