and the conflict featured frequent use of the Roman Rhine flotilla. In the last phase of the war, the British fleet and legio XIV were brought in from Britain to attack the Batavian coast, but the Cananefates, allies of the Batavians, were able to destroy or capture a large part of the fleet. In the meantime, the new Roman commander, Quintus Petillius Cerialis, advanced north and constructed a new fleet. Civilis attempted only a short encounter with his own fleet, but could not hinder the superior Roman force from landing and ravaging the island of the Batavians, leading to the negotiation of a peace soon after. In the years 82 to 85, the Romans under Gnaeus Julius Agricola launched a campaign against the Caledonians in modern Scotland. In this context the Roman navy significantly escalated activities on the eastern Scottish coast. Simultaneously multiple expeditions and reconnaissance trips were launched. During these the Romans would capture the Orkney Islands (Orcades) for a short period of time and obtained information about the Shetland Islands. There is some speculation about a Roman landing in Ireland, based on Tacitus reports about Agricola contemplating the island's conquest, but no conclusive evidence to support this theory has been found. Under the Five Good Emperors the navy operated mainly on the rivers; so it played an important role during Trajan's conquest of Dacia and temporarily an independent fleet for the Euphrates and Tigris rivers was founded. Also during the wars against the Marcomanni confederation under Marcus Aurelius several combats took place on the Danube and the Tisza. Under the aegis of the Severan dynasty, the only known military operations of the navy were carried out under Septimius Severus, using naval assistance on his campaigns along the Euphrates and Tigris, as well as in Scotland. Thereby Roman ships reached inter alia the Persian Gulf and the top of the British Isles. 3rd century crisis As the 3rd century dawned, the Roman Empire was at its peak. In the Mediterranean, peace had reigned for over two centuries, as piracy had been wiped out and no outside naval threats occurred. As a result, complacency had set in: naval tactics and technology were neglected, and the Roman naval system had become moribund. After 230 however and for fifty years, the situation changed dramatically. The so-called "Crisis of the Third Century" ushered a period of internal turmoil, and the same period saw