DREW HINSHAW:

That's right. What they've been able to do here is empty out an entire countryside. The very far northeast part of Nigeria. Town after town after town is abandoned and Boko Haram has been able to do that just by sort of constantly, like you said, starting with hit and run attacks and eventually moving entire units into these towns scaring lots of people out.

You hear over and over again when you talk to people from these towns, the only people left in those towns are basically the elderly people, who don't really want to move, or can't move and don't really pose a threat to Boko Haram. What's interesting is they are raising their flags in some places, not all places. They're not really sticking around and governing them, like you had in northern Mali.

They kind of go in, they make some weak effort to impose Sharia law, they tell women how to dress and then they go back into the caves and mountains and forests where they're camped out. They don't want to be sitting ducks in these towns.