Agricola 17

1But when Vespasian recovered Britain too along with the rest of the world, there were great generals and excellent armies, and the enemy's hopes were diminished. 2And Petilius Cerialis at once struck terror by attacking the state of the Brigantes, which is said to be the most populous of the whole province. 2There were many battles, some of them not without bloodshed; 2and he took in a large part of the Brigantes either by victory or by war. 3And Cerialis would indeed have overshadowed the diligence and the fame of any other successor: but Julius Frontinus, a great man, so far as greatness was then allowed, took up the burden and subdued by arms the strong and warlike tribe of the Silures, struggling against the difficulties of the terrain as well as the courage of the enemy.