This prominence of lighter craft in the historical narrative is perhaps best explained in light of subsequent developments. After Actium, the operational landscape had changed: for the remainder of the Principate, no opponent existed to challenge Roman naval hegemony, and no massed naval confrontation was likely. The tasks at hand for the Roman navy were now the policing of the Mediterranean waterways and the border rivers, suppression of piracy, and escort duties for the grain shipments to Rome and for imperial army expeditions. Lighter ships were far better suited to these tasks, and after the reorganization of the fleet following Actium, the largest ship kept in service was a hexareme, the flagship of the "Classis Misenensis". The bulk of the fleets was composed of the lighter triremes and liburnians (Latin: "liburna", Greek: "libyrnis"), with the latter apparently providing the majority of the provincial fleets. In time, the term "liburnian" came to mean "warship" in a generic sense.