The "Classis Pannonica" and the "Classis Moesica" were broken up into several smaller squadrons, collectively termed "Classis Histrica", authority of the frontier commanders ("duces"). with bases at Mursa in Pannonia II, Florentia in Pannonia Valeria, Arruntum in Pannonia I, Viminacium in Moesia I and Aegetae in Dacia ripensis. Smaller fleets are also attested on the tributaries of the Danube: the "Classis Arlapensis et Maginensis" (based at Arelape and Comagena) and the "Classis Lauriacensis" (based at Lauriacum) in Pannonia I, the "Classis Stradensis et Germensis", based at Margo in Moesia I, and the "Classis Ratianensis", in Dacia ripensis. The naval units were complemented by port garrisons and marine units, drawn from the army. In the Danube frontier these were: