 By about 8 AD, Arminius had gained the upper hand and began planning rebellion.Segestes repeatedly warned Publius Quinctilius Varus, the governor of Gaul, that rebellion was being planned, but Varus declined to act until the rebellion had broken out.In 9 AD, in the Battle of the Teutoburg Forest, an army of allied Germanic tribes under the command of Arminius (the Cherusci, Bructeri, Marsi, Sicambri, Chauci, and Chatti) annihilated three Roman legions commanded by Varus.