Tacitus mentions them repeatedly, in particular in the context of the wars of Germanicus. They had been part of the tribal coalition of the Cheruscian war leader and traitor to Rome, Arminius that in 9 AD annihilated three Roman legions under Varus in the Battle of Teutoburg Forest. Germanicus, seeking revenge for this defeat, invaded the lands of the Marsi in 14 AD with 12,000 legionnaires, 26 cohorts of auxiliaries and eight cavalry squadrons. The Marsi were massacred during a festival near a temple dedicated to Tamfana. According to Tacitus, an area of 50 Roman miles was laid to waste with fire and sword: No sex, no age found pity. One Legion Eagle was recovered from the Marsi during this campaign