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The flag of the Islamic State of Iraq and the Levant (ISIL) flutters on the "dome" of the  Armenian Catholic Church of the Martyrs in the northern rebel-held Syrian city of Raqqa on September 28, 2013.
The flag of the Islamic State of Iraq and the Levant (ISIL) flutters on the "dome" of the  Armenian Catholic Church of the Martyrs in the northern rebel-held Syrian city of Raqqa on September 28, 2013.

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    The challenges surrounding the Raqqa offensive

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The challenges surrounding the Raqqa offensive

Aaron Stein, a senior fellow at the Atlantic Council, looks ahead with CNN's Michael Holmes at the fight to retake Raqqa from ISIS.

The challenges surrounding the Raqqa offensive

Aaron Stein, a senior fellow at the Atlantic Council, looks ahead with CNN's Michael Holmes at the fight to retake Raqqa from ISIS.