The occupying troops, "Exercitus Noricus", consisted mostly of auxilia cohorts and a legion stationed in "Lauriacum/"Enns acted as the strategic reserve. The surveillance and security of the Danube and its tributaries were the responsibility of the "Classis Pannonia". Units of the legions, naval and auxiliary forces were commanded by the respective governors. In late antiquity - according to "Notitia Dignitatum" - four newly established flotillas undertook this task. From the 3rd century, the Norian "comitatenses", "ripenses" and "liburnari" were under the command of two generals: