The Nazi leader Rudolph Hess defined "eternity" as the "endless flow of blood." This was his definition of Nazism: The ENDLESS FLOW OF BLOOD.

This is a good definition of political violence: generation of an endless flow of blood.

The history of civilization: an endless flow of blood feeding some abstract entity (the nation-state, Allah, whatever). The entity attains substantial existence by virtue of blood endlessly flowing into it.

 No need for historians to write monumental tomes/tombs on specific wars. Just sum things up--"an endless flow of blood was shed."