An accurate judgment upon this point cannot be formed by mastering only such facts of the particular contest as have been clearly transmitted, for as usual the naval transactions have been slightingly passed over; there is needed also familiarity with the details of general naval history in order to draw, from slight indications, correct inferences based upon a knowledge of what has been possible at periods whose history is well known.

The control of the sea, however real, does not imply that an enemy's single ships or small squadrons cannot steal out of port, cannot cross more or less frequented tracts of ocean, make harassing descents upon unprotected points of a long coast-line, enter blockaded harbors.

On the contrary, history has shown that such evasions are always possible, to some extent, to the weaker party, however great the inequality of naval strength.

It is not therefore inconsistent with the general control of the sea, or of a decisive part of it, by the Roman fleets, that the Carthaginian admiral Bomilcar in the fourth year of the war, after the stunning defeat of Cannae, landed four thousand men and a body of elephants in south Italy; nor that in the seventh year, flying from the Roman fleet off Syracuse, he again appeared at Tarentum, then in Hannibal's hands; nor that Hannibal sent despatch vessels to Carthage; nor even that, at last, he withdrew in safety to Africa with his wasted army.

None of these things prove that the government in Carthage could, if it wished, have sent Hannibal the constant support which, as a matter of fact, he did not receive; but they do tend to create a natural impression that such help could have been given.