 In 12 BC, Drusus led a successful campaign into Germania, subjugating the Sicambri.Later that year he led a naval expedition against Germanic tribes along the North Sea coast, conquering the Batavi and the Frisii, and defeating the Chauci near the mouth of the Weser.In 11 BC, he conquered the Usipetes and the Marsi, extending Roman control to the Upper Weser.