Asterix : Asterix and the Goths 3 by Rene Goscinny,Albert Uderzo

Asterix and Obelix escort Getafix to the druids' annual conference in the Forest of the Carnutes. Little do they know that the Goths are lying in ambush, ready to kidnap the Druid of the Year - who of course is Getafix! But what with Gauls, Goths and Romans all at odds, it's hard to tell friend from foe... until Goths begin fighting Goths in the Asterixian Wars.