In the ancient world, to raid and retreat was standard warfare practice.

That model was turned on its head by the Roman Empire. They established permanent relationships with the territories they conquered, introducing systems of citizenship, law, and infrastructure.

From Spain to Israel and beyond, this was not mere colonization, but assimilation.

In a time when sheer force of numbers determined outcomes, this approach enabled mobilization of unforeseen numbers, 700,000 or more.

Conquest wasn’t an end in itself but the mechanism of an empire designed for permanence.