Caesar incenso Mattio (id genti caput) aperta populatus vertit ad Rhenum, non auso hoste terga abeuntium lacessere, quod illi moris, quotiens astu magis quam per formidinem cessit.
Translation :
After burning Mattium, the capital of the tribe, and ravaging the open country, Germanicus marched back towards the Rhine, the enemy not daring to harass the rear of the retiring army, which was his usual practice whenever he fell back by way of stratagem rather than from panic.
Edition :
Annales ab excessu divi Augusti. Cornelius Tacitus. Charles Dennis Fisher. Clarendon Press. Oxford. 1906.
Complete Works of Tacitus. Tacitus. Alfred John Church. William Jackson Brodribb. Sara Bryant. edited for Perseus. New York. : Random House, Inc. Random House, Inc. reprinted 1942.