On landing we went over the castle, which resembles, in some respects, that of Gibraltar, as the fortifications are of an irregular form, to suit the nature of the ground.  Excavated far below in the chalk rock are numerous galleries, from which heavy guns would thunder forth an unmistakeable warning to any foes attempting to enter the harbour, or to flaunt their flags within range.  Until a few years ago both the inner and outer harbours were dry at low water but now a fine new harbour has been formed.