Cameroon has deployed about 1000 troops and armoured vehicles to the border with Nigeria to counter a rising threat from Boko Haram.
The Defence Ministry said their mission will be to carry out reconnaissance and be ready to respond with fire power.
Lieutenant Colonel Didier Badjeck said Special Forces left the capital on Monday. Several armoured vehicles were deployed three days earlier.
"Their mission will be to carry out reconnaissance and be ready to respond with enough fire power," he told Reuters. "They are patrolling in northern region at the moment."
Cameroon earlier deployed 700 troops under a joint regional effort to fight Boko Haram in March.
Boko Haram is known for killing civilians and abducting more than 200 schoolgirls in northern Nigeria on 14 April.
It is suspected of attacking a Chinese workers camp in northern Cameroon this month. Ten Chinese workers are still missing.