Probably one of the most formidable defensive structures built before the advent of modern weaponry. Three sets of walls that stretch across the entire Golden Horn. Cordus' capital will have a set of these.
This illustration portrays the Siege of Tripoli by the Byzantine army of Emperor Basil II. The defenders are probably a mixture of Fatimid warriors and local Arab soldiers. Tripoli had achieved a semi-independence under Fatimid rule.
For cargo transport, the Byzantines usually commandeered ordinary merchantmen as transport ships (phortēgoi) or supply ships (skeuophora). These appear to have been mostly sailing vessels, rather than oared.