Divided Not Conquered: How Rebels Fracture and Splinters Behave

From terrorist disputes to splinter offshoots, an inside look at how armed groups break apart.

Terrorist, rebel, and insurgent groups are highly unstable. Amid fears of defeat and even death, intense disagreements have torn many organizations apart, from Syria to Iraq, Ireland to Spain. And while some of these divisions have preceded a group's decline and eventual defeat, others have launched some of the most notorious and deadly organizations in recent history.

In Divided Not Conquered, Eva...