The rabbits and the eagles were at war, and the rabbits were losing.
The eagles were able to seize the rabbits with their talons and beaks, but the rabbits had no weapons of their own.
"If we don't have weapons," said the leader of the rabbits, "then we must have allies!"
The rabbits then decided to ask the foxes to be their allies, but the foxes refused.
"We might be willing to help you," they said, "if we did not know just who you are and who you are fighting against."
It is hard to find allies when you're losing.
Inspired by: Mille Fabulae et Una, a collection of Latin fables that I've edited, free to read online. I am not translating the Latin here; instead, I am just telling a 100-word version of the fable.
Notes: This is fable 165 in the book, which is Perry 256.