 Led by Civilis, they inflicted huge casualties on the Romans, including the destruction of a Roman fleet by a Germanic one off the North Sea coast.Led by Cerialis, the Romans gave as good as they had gotten, ultimately forcing a humiliating peace on the Batavi and stationing a legion on their territory.Both the Chauci and the Frisians had auxiliaries serving under the Romans, and in a siege and assault by Civilis at "Colonia Claudia Ara Agrippinensis" (at modern Cologne), a cohort of Chauci and Frisians had been trapped and burned.