 He teaches them heretical versions of stories from the Bible and Gospels.When that fails, he uses sabotage, and his expertise with fireworks to drive the Spaniards away.Fo researched the journals of a number of European explorers of the fifteenth and sixteenth centuries and wrote the play in a dialect that drew upon the Lombardian, Venetian, Catalanian, Castilian, Provençal, Portuguese and Arabic.