4 legions more at the Rhine river. Actually it had been 11 legions, before Claudius started his campain in Britain. Caligula already moved most of them to Germania. And emperor Claudius the gimp still needs a victory badly. What do you think he is doing with these 4 legions more at the Rhine? Galba was fighting the Chatti in 40/41 AD and Gabinius the Chauci. It is pretty obvious, what Claudius will do with these 4 legions! And if he is succesfull, this changes everything.