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has been remarked in the preceding chapter that Cæsar does not appear to have received any commission for the subjugation of Gaul when he took military charge of his three provinces. The Gauls were still feared in Rome, and it was his duty to see that they did not make their way over the Alps into the Roman territory. It was also his duty to protect from invasion, and also from rebellion, that portion of Gaul which had already been constituted a Roman province, but in which the sympathies of the people were still rather with their old brethren than with their new masters. The experience, however, which we have of great and encroaching empires tells us how probable it is that the protection of that which the strong already holds should lead to the grasping of more, till at last all has been grasped. It is thus that our own empire in India has grown. It was thus that the Spanish empire grew in America. It is thus that the empire of the United States is now growing. It was thus that Prussia, driven, as we all remember, by