I hope @kakaballi you’ll find the answer to your recent thread on ISIS here.
Petraeus: Use Al Qaeda Fighters to Beat ISIS - The Daily Beast
The former commander of U.S. forces in Iraq and Afghanistan has been quietly urging U.S. officials to consider using so-called moderate members of al Qaeda’s Nusra Front to fight ISIS in Syria, four sources familiar with the conversations, including one person who spoke to Petraeus directly, told The Daily Beast.
**The heart of the idea stems from Petraeus’s experience in Iraq in 2007, when as part of a broader strategy to defeat an Islamist insurgency the U.S. persuaded Sunni militias to stop fighting with al Qaeda and to work with the American military.
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**The tactic worked, at least temporarily. But al Qaeda in Iraq was later reborn as ISIS, and has become the sworn enemy of its parent organization. **Now, Petraeus is returning to his old play, advocating a strategy of co-opting rank-and-file members of al Nusra, particularly those who don’t necessarily share all of core al Qaeda’s Islamist philosophy.