Answer
Germanicus commanded eight Roman legions in his campaigns from AD 14 to 16. These legions were drawn from the Rhine and Danube frontiers and included the I Germanica, I Adiutrix, V Alaudae, XX Valeria Victrix, XXI Rapax, and XXII Primigenia. The legions were well-trained and experienced, and their presence gave Germanicus a significant advantage over the Germanic tribes he faced.