Asterix #7: Asterix and the Big Fight

Gaul was divided into three parts. No, four parts - for one small village of indomitable Gauls still held out against the Roman invaders. BOOK 7 The Romans persuade a Gaulish chief to challenge Vitalstatistix to single combat. This poses no threat until Getafix is hit by a flying menhir and forgets how to make the magic potion.