In the years 15 and 16, Germanicus carried out several fleet operations along the rivers Rhine and Ems, without permanent results due to grim Germanic resistance and a disastrous storm. By 28, the Romans lost further control of the Rhine mouth in a succession of Frisian insurgencies. From 43 to 85, the Roman navy played an important role in the Roman conquest of Britain. The "classis Germanica" rendered outstanding services in multitudinous landing operations. In 46, a naval expedition made a push deep into the Black Sea region and even travelled on the Tanais. In 47 a revolt by the Chauci, who took to piratical activities along the Gallic coast, was subdued by Gnaeus Domitius Corbulo. By 57 an expeditionary corps reached Chersonesos (see Charax, Crimea).