Answer:
I believe the answer to be "creativity."
Explanation:
In the story "Leiningen versus the Ants", the main character is a farmer in Brazil. He is warned that a swarm of army ants are on their way and is advised to run away. Leiningen, however, decides to stay and fight. He convinces his men to help him and, even though very injured at the end, he wins.
Throughout the story, Leiningen has to come up with several different solutions. Every time the ants are able to break his defenses, Leiningen must use his creativity to find a new way to defeat them. He uses moats filled with water, then moats filled with petrol and, when everything seems lost, he sees in a dam the solution. By flooding his plantation, he's able to save his men and himself, and avoids losing eveything he had achieved.
Even though power could also be a theme, Leiningen's power seems to come from his creativity. That's why I believe it to be the best answer.