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. In addition, there were smaller oared vessels, such as the navis actuaria, with 30 oars (15 on each bank), a ship primarily used for transport in coastal and fluvial operations, for which its shallow draught and flat keel were ideal. In late antiquity, it was succeeded in this role by the navis lusoria ("playful ship"), which was extensively used for patrols and raids by the legionary flotillas in the Rhine and Danube frontiers. Roman ships were commonly named after gods (Mars, Iuppiter, Minerva, Isis), mythological heroes (Hercules), geographical maritime features such as Rhenus or Oceanus, concepts such as Harmony, Peace, Loyalty, Victory (Concordia, Pax, Fides, Victoria) or after important events (Dacicus for the Trajan's Dacian Wars or Salamina for the Battle of Salamis). They were distinguished by their figurehead (insigne or parasemum), and, during the Civil Wars at least, by the paint schemes on their turrets, which varied according to each fleet. Armament and tactics In classical antiquity, a ship's main weapon was the ram (rostra, hence the name navis rostrata for a warship), which was used to sink or immobilize an enemy ship by holing its hull. Its use, however, required a skilled and experienced crew and a fast and agile ship like a trireme or quinquereme. In the Hellenistic period, the larger navies came instead to rely on greater vessels. This had several advantages: the heavier and sturdier construction lessened the effects of ramming, and the greater space and stability of the vessels allowed the transport not only of more marines, but also the placement of deck-mounted ballistae and catapults. Although the ram continued to be a standard feature of all warships and ramming the standard mode of attack, these developments transformed the role of a warship: from the old "manned missile", designed to sink enemy ships, they became mobile artillery platforms, which engaged in missile exchange and boarding actions. The Romans in particular, being initially inexperienced at sea combat, relied upon boarding actions through the use of the Corvus. Although