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Rh legions on the west. Roman armies, moving from the province of Gaul, established a chain of fortresses along the right as well as the left bank of the Rhine, and, in a series of victorious campaigns, advanced their eagles as far as the Elbe; which now seemed added to the list of vassal rivers, to the Nile, the Rhine, the Rhone, the Danube, the Tagus, the Seine, and many more, that acknowledged the supremacy of the Tiber. Roman fleets also, sailing from the harbours of Gaul along the German coasts and up the estuaries, co-operated with the land-forces of the empire, and seemed to display, even more decisively than her armies, her overwhelming superiority over the rude Germanic tribes. Throughout the territory thus invaded, the Romans had, with their usual military skill, established fortified posts; and a powerful army of occupation was kept on foot, ready to move instantly on any spot where any popular outbreak might be attempted. Vast, however, and admirably organized as the fabric of Roman power appeared on the frontiers and in the provinces, there was rottenness at the core. In Rome's unceasing hostilities with foreign foes, and still more, in her long series of desolating civil wars, the free middle classes of Italy had almost wholly disappeared. Above the position which they had occupied, an oligarchy of wealth