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A key turning point in the U.S.-led war against the Iraqi insurgency came even before last winter's troop surge

A map drawn by Al Qaeda in Iraq leader Abu Musab al-Zarqawi — who was killed last year by U.S. forces — turned up last December in an Al Qaeda safe house and essentially gave U.S. war planners insight into the terrorist group's methods for moving explosives, fighters and money into Baghdad.

The map essentially laid out how Al Qaeda controlled Baghdad

"And [U.S.-led forces] simply made the decision to reduce these belts one at a time, and essentially what that did was it choked off Al Qaeda's access to the city. And once that was done, Al Qaeda had no alternative but to leave the city, to leave the belts and to retreat into the city of Baquba," Scales said.

U.S. military planners used those maps to choke off Al Qaeda, moving ring by ring, hunting and destroying Al Qaeda in Baghdad, flushing them out of their urban strongholds and picking them off as easy targets in the desert.