What are the conditions needed for a civil war to start? Could we see a modern industrial nation turn upon itself again? Historians Tom Holland and Dominic Sandbrook explore examples from ancient history though to Spain in the 1930s and Yugoslavia in the 1990s to work out what it takes for neighbour to murder neighbour.

A Goalhanger Films & Left Peg Media production

Produced by Jack Davenport

Exec Producer Tony Pastor

Twitter: @TheRestHistory #TheRestIsHistory

Email: theresthistory@gmail.com

@holland_tom

@dcsandbrook