1 {scene: An island off the coast of Antigua. The native cannibals have Captain Long Tom Short and Dirty Dirque stewing in a giant pot.}
1 Ponsonby: {bursting on to the scene} Release those pirates! They're now our prisoners!
1 Native: You and whose army?
2 Ponsonby: We're the Royal Navy! We don't need an army! We have muskets!
3 Native: We have hordes of silent, invisible warriors hiding in the bushes, armed with blowguns and curare-tipped darts.
4 [caption]: Ten minutes later... {Ponsonby and his Mate are now in the cooking pot}
4 Mate: I'm thinking an army would come in handy right about now, sir.

Curare is a potent toxin derived from various South American plants. The sources are mostly from the Amazon River basin region, but Antigua is close enough that they could probably get some imported.