In Asterix and the Gauls, Caesar says that he will send Crismus Bonus to Outer Mongolia, to deal with a "Barbarian Rebellion".
As far as I know, Outer Mongolia is quite far away from the borders of the Roman Empire at the time? The Romans might have have had some trade with the Far East, but certainly they would not be concerned with rebellions, or be sending troops there?
Or is that the point? Sending Crismus Bonus and his men to Mongolia means he will be killed by the nomads there? Or is Ceasar just joking?