Following the invasion of Iraq in 2003 the U.S. military found itself in a battle with a lethal and adaptive insurgency, where the divisions between enemy and ally were ambiguous at best, and working with the local population was essential for day-to-day survival. From the lessons they learned during multiple tours of duty in Iraq, two American veterans have penned "The Defense of Jisr al-Doreaa," an instructional parable of counterinsurgency that addresses the myriad of difficulties associated with war in the postmodern era.

In this tactical primer based on the military classic "The...