Asterix and the Big Fight by Rene Goscinny and Albert Uderzo
The Romans want to take advantage of an ancient Gaulish custom--if a chief can beat another chief in unarmed combat, the winning chief becomes the ruler of the loser's village. They find the ambitious and tough Cassius Ceramix of Linoleum to fight another chief. Once he agrees they tell him he is to fight Vitalstatistix. Ceramix is afraid but the Romans decide to capture or kill Getafix, the druid whose potions make Vitalstatistix have superhuman strength. They comically fail but Obelix nails him with a menhir and Getafix loses his memory. Too bad the village just ran out of potion. Can they get his memory back before the big fight? Will the Romans finally conquer all of Gaul?
This is another fun adventure with Asterix and company. It's not as funny as other issues I've read but is still an enjoyable read.