BBC Hausa's Jimeh Saleh was granted exclusive access to Boko Haram's stronghold in the Sambisa forest in north-eastern Nigeria.
Travelling with the Nigerian army, he went to see how far the region had come since Nigeria's President Muhammadu Buhari vowed to crush the group by the end of 2015 when he was elected in May.
Boko Haram's six-year insurgency has seen more than 17,000 people killed and over a million others displaced.
