An official in the Chadian Army said the Chadian and Cameroonian troops were ready to attack Sambisa forest, which lies near the Cameroon border, from the other side and would move in soon.
A Cameroonian Army official also said Chadian troops are assembling in Mora, northern Cameroon, ahead of the joint operation.
The Director of Defence Information, Major General Chris Olukolade, said the Boko Haram terrorists had run out of arms and ammunition.
The military spokesman noted that the Boko Haram terrorists have only bows and arrows, machetes, daggers and other local weapons.
He added that the terrorists were roaming about in the bushes of the villages along the fringes of Sambisa forest.
Nigerian, Cameroon, Chadian and Nigerien armies have in the past two months launched combined operations to crush the Boko Haram insurgents, who have killed thousands and kidnapped hundreds in the past few years in their course to establish an Islamic state.
The Sambisa forest is a vast former colonial game reserve in the north eastern region of Nigeria, which is about 100 km (60 miles) from the Chibok village where the terrorists group kidnapped more than 200 secondary school girls on April 14th, 2014.