 Fleet bases included such ports as Ravenna, Arles, Aquilea, Misenum and the mouth of the Somme River in the West and Alexandria and Rhodes in the East.Flotillas of small river craft ("classes") were part of the "limitanei" (border troops) during this period, based at fortified river harbors along the Rhine and the Danube.The fact that prominent generals commanded both armies and fleets suggests that naval forces were treated as auxiliaries to the army and not as an independent service.