Cornelius Tacitus, The History
Alfred John Church, William Jackson Brodribb, Ed.

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There was greater danger at Grinnes and Vada. Civilis attacked Vada, Classicus Grinnes, and they could not be checked, for our bravest men had fallen, among them Briganticus, who commanded a squadron of cavalry, and of whose loyalty to the Roman cause and enmity to his uncle Civilis I have already spoken. But when Cerialis came up with a picked body of cavalry, the fortune of the day changed, and the Germans were driven headlong into the river. Civilis, who was recognised while seeking to stop his flying troops, became the mark of many missiles, left his horse, and swam across the river. Verax escaped in the same way. Some light vessels were brought up, and carried off Tutor and Classicus. Even on this occasion the Roman fleet was not present at the engagement, though orders had been given to that effect. Fear kept them away, and their crews were dispersed about other military duties. Cerialis in fact allowed too little time for executing his commands; he was hasty in his plans, though eminently successful in their results. Fortune helped him even where skill had failed, and so both the general and his army became less careful about discipline. A few days after this he escaped the peril of actual capture, but not without great disgrace.