Ulisse's journey to the Roman Empire continues to discover its military strength, that is, the violent and implacable arm of its legions. Thanks to the best reconstructions of the experts, we will follow the armies on the march, we will understand how they fought, we will discover who his soldiers were and how far they went. We will see how Rome imposed itself through the skill of its generals and engineers, but also through its ability to export a model of civilization. In this regard, we will try to understand why the Romans managed to extend over such a large surface area and above all why their culture, so advanced and so successful, was adopted by all the populations of Europe and the Mediterranean.