Amphibious warfare

[LVCIVS SERGIVS ANTONINVS]

An artistic impression of the Cartago Nova stronghold at the time of the roman attack by Scipio. The lagoon, now dry land, was behind the city and the main port on the foreground. What really puzzles me is the fact that in this part of the Mediterranian Sea the tides are nearly imperceptible, therefore I cannot understand how the tide could rise and lower so much then, unless at that time for some reason the variation in the sea levels was very different from today.