(CNN) -- The new video released by Boko Haram leader Abubakar Shekau makes a simple demand: He won't release the more than 200 schoolgirls his group abducted from a school northern Nigeria "until after you release our brethren." The "brethren" he refers to include several hundred Boko Haram fighters, including key commanders, currently held in jails in Nigeria, as well as in Niger and Cameroon. It is a demand that he has made before, and a demand that, crucially, the Nigerian government has at least once conceded. Almost exactly a year ago, fighters from Boko Haram entered a dusty town close to the border with Cameroon. They headed for the police station, army barracks and prison buildings. The dawn raid on May 7, 2013, on the town of Bama left more than 100 people dead, including many civilians. The Boko Haram fighters freed about 100 inmates from the prison.
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Boko Haram demands release of its fighters for return of abducted Nigerian schoolgirls
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Boko Haram has kidnapped before and Nigeria has conceded at least once
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A raid on a town last year freed inmates, and Boko Haram took about a dozen hostages
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Nigeria freed wives and children of Boko Haram members in return for the hostages
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Days after the @placeholder raid, Boko Haram's Shekau appeared in a video that showed the hostages.
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Zenn said "@placeholder wants all Boko Haram prisoners freed because they because they will have renewed loyalty to him, and him alone" after internal rifts in 2012 and 2013.
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Zenn said "Shekau wants all @placeholder prisoners freed because they because they will have renewed loyalty to him, and him alone" after internal rifts in 2012 and 2013.
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"And the militants freed from prison will allow Boko Haram to benefit from their bomb-making and kidnapping skills to launch new and fiercer attacks in @placeholder, Cameroon and the border region," he said.
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"We are holding them hostage because the leaders of Cameroon and @placeholder detained our women and children under inhumane conditions," he said.
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After secret negotiations between Shekau and the Cameroonian government (through intermediaries), @placeholder released the family near the Nigerian-Cameroon border -- reportedly in exchange for a $3 million ransom and the release of 16 Boko Haram prisoners held in Cameroon.
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After secret negotiations between Shekau and the Cameroonian government (through intermediaries), Boko Haram released the family near the Nigerian-@placeholder border -- reportedly in exchange for a $3 million ransom and the release of 16 Boko Haram prisoners held in Cameroon.