In this way matters were arranged on the lower Rhine after the abandonment of the more comprehensive projects, and thus a not inconsiderable territory on the right bank was still held by the Romans. But various inconvenient complications arose in connection with it. Towards the end of the reign of Tiberius (28) the Frisians, in consequence of intolerable oppression in the levying of tribute in itself small, revolted from the empire, slew the people employed in levying it, and besieged the Roman commandant acting there, with the rest of the Roman soldiers and civilians sojourning in the territory, in the fortress of Flevum, where, previous to the extension of the Zuyder See that took place in the Middle Ages, lay the eastmost mouth of the Rhine, near the modern island Vlieland beside the Texel. The rising assumed such proportions that both armies of the Rhine marched in concert against the Frisians; but still the governor Lucius Apronius accomplished nothing. The Frisians gave up the siege of the fortress, when the Roman fleet brought up the legions; but it was difficult to get near the Frisians themselves in a country so much intersected; several Roman corps were destroyed in detail, and the Roman advanced guard was so thoroughly defeated that even the dead bodies of the fallen were left in the power of the enemy. The matter was not brought to a decisive action, nor yet to a true subjugation; Tiberius, the older he grew, became ever less inclined to larger enterprises, which gave to the general in command a position of power. With this state of things was connected the fact that in the immediately succeeding years the neighbours of the Frisians, the Chauci, became very troublesome to the Romans; in the year 41 the governor Publius Gabinius Secundus had to undertake an expedition against them, and six years later (47) they even pillaged far and wide the coast of Gaul with their light piratical vessels under the leadership of the Roman deserter Gannascus, by birth one of the Cannenefates. Gnaeus Domitius Corbulo, nominated governor of Lower Germany by Claudius, put a stop with his fleet to these forerunners of the Saxons and Normans, and afterwards vigorously brought back the Frisians to obedience, by organising anew their commonwealth and stationing a Roman garrison among them. [Sidenote: The occupation of the right bank abandoned.]