Note 103 The fleet of Drusus had failed in their attempt to pass, or even to approach, the Sound (styled, from an obvious resemblance, the Columns of Hercules), and the naval enterprise was never resumed (Tacit. de Moribus German, c. 34). The knowledge which the Romans acquired of the naval powers of the Baltic (c. 44, 45) was obtained by their land journeys in search of amber.

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The History Of The Decline and Fall Of The Roman Empire— Chapter 25