Asterix: Asterix and the Secret Weapon

Bravura proves a useful ally in countering Julius Caesar's secret weapon - the Roman leader has sent in a troop of female legionaries, relying on the chivalrous Gauls not to fight women. But Bravura has no such scruples, and together with Asterix thinks up a good idea.
A woman bard in Ancient Gaul? A shocking idea, but that's what the Gauls get when the mothers in Asterix's village hire Bravura to teach their children. Although she, Asterix and Obelix are unlikely allies, between them they fight back against Julius Caesar's secret weapon. What can that weapon be? And how can even Cacofonix help?