Obviously, in spaces almost empty of men it is easy for the weaker simply to evade the onslaught, and as a rule he was able to do so. But in later and denser conditions, the inroad spelt dispossession for the weaker, who must either defend himself successfully or else win new lands for old. Already there is the out-thrust into space. No tribe lives without constant contacts on all sides and a mistrustful readiness to stand to arms. The hard necessity of war breeds men. Peoples grow by, and against, other peoples to inward greatness. Weapons become weapons against men and not beasts. And finally we have the only migration-form that counts in historic times--warrior bands sweep through thoroughly populated countries, whose inhabitants remain, undisturbed and upstanding, as an essential part of the spoils of victory. And then, the victors being in a minority, completely new situations arise. Peoples of strong inward form spread themselves on top of much larger but formless populations, and the further transformations of peoples, languages, and races depend upon very complicated factors of detail. Since the decisive investigations of Beloch[225] and Delbrück[226] we know that all migrant peoples--and the Persians of Cyrus, the Mamertines and the Crusaders, the Ostrogoths and the “Sea-peoples” of the Egyptian inscriptions were all peoples in this sense--were, in comparison with the inhabitants of the regions they occupied, very small in numbers, just a few thousand warriors, superior to the natives only in respect of their determination to _be_ a Destiny and not to submit to one. It was not inhabitable, but inhabited, land of which they took possession, and thus the relation between the two peoples became a question of status, the migration turned into the campaign, and the process of settling down became a political process. And here again, in presence of the fact that at a historic distance of time the successes of a small war-band, with the consequent spread of the victor’s names and language, may all too easily be taken for a “migration of peoples,” it is necessary to repeat our question, what, in fact, the men, things, and factors are that _can_ migrate.