"We are fed up with fighting this war all alone," a Cameroonian officer said, describing the fight with Boko Haram and the lack of military support.
"The attacks against our territory come from a neighboring country, which calls itself sovereign and does nothing," said a defense ministry official who asked not to be named, as quoted be AFP.
The official also complained that Cameroon has been drawn into a "proxy war" against Boko Haram, which intensified violence in villages in Cameroon’s far north and in Nigeria.
Last Friday, suspected Boko Haram militants conducted a suicide bomb and attack on the central mosque in the Nigerian city of Kano killing at least 120 people.
In mid-October, Islamists equipped with a tank and a booby-trapped car bomb sieged an army position in Amchide. The fighting left 107 Boko Haram members and eight Cameroonian soldiers dead.
"We are on our own at the front," said a commander of the elite Israeli-trained Rapid Intervention Brigade.
In northeastern Nigeria, Boko Haram controls large swathes of territory abandoned by the authorities, leaving local residents to the mercy of fate.
In August, 500 Nigerian troops crossed into Cameroon, but the army command reported the soldiers were "charging through the borders in a tactical maneuver", according to AFP.
The Cameroonian army is getting used to seeing Nigerian soldiers arriving, but for a quite different purpose – fleeing Boko Haram.
Meanwhile, Cameroon has come under criticism from neighbouring countries and former colonial power France for not taking measures to stop Boko Haram from using its territory as a support base for its war in Nigeria.