Sexual violence and mass rape have long been used as a weapon of war. It is not only the victims and survivors who suffer trauma - an entire generation of men, women and children are affected. All too often, the perpetrators remain unpunished.

As the rules prohibiting the use of force are crumbling, we risk returning to a world where might is right and war is legal.

Martin van Creveld’s new book asks hard questions about America’s ability to defend itself as our society undergoes revolutionary changes, mostly undesired by its citizens. By Fabius Maximus.