paul tillsly is live in johannesburg, south africa with more. >> reporter: arthel, fox news has learnedhe u.s. drones high-tech imagery and careful analysis by american specialists by the data they provide is turning the tide against the terror group boko haram. one has seen the drones at their cameroon base. >> it's been a real game-changer. it's moved surveillance and analysis into the 21st century. it's providing clear imagery of boko haram bomb factories, troupe movement, camps, so it's making a sizable difference. >> reporter: the m21 predator drones are flying out of northern cam roorngs close to the borders of nigeria and chad, the gray eagles as known, including this one seen above the base, have only been in operation less than a month but knowing at last where the boko haram fighters are at any time has enabled african ground troops catch them unaware and force them out of at least two nigerian towns, and the intel has enabled multiple ambushes. so far it's reported in total. they have helped local troops reportedly take out well over 100 terrorists. no news yet though on the