The Annals and the Histories · Hist. 5.19

The next day the 14th legion was sent into the Upper Province to join Gallus Annius. The 10th, which had arrived from Spain, supplied its place in the army of Cerialis. Civilis was joined by some auxiliaries from the Chauci. Nevertheless he did not venture to fight for the defence of the Batavian capital, but carrying off property that could be removed, and setting fire to the remainder, he retreated into the island, aware that there were not vessels enough for constructing a bridge, and that the Roman army could not cross the river in any other way. He also demolished the dyke, constructed by Drusus Germanicus, and, by destroying this barrier, sent the river flowing down a steep channel on the side of Gaul. The river having been thus, so to speak, diverted, the narrowness of the channel between the island and Germany created an appearance of an uninterrupted surface of dry ground.…

Cornelius Tacitus · trans. Church & Brodribb, 1876
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