Asterix and the big fight (Rev. ed)

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.