In the second volume of Fables, Animal Farm, we see that the Fables possess an enormous amount of various firearms:
Where did they come from? Snow White states in the first volume that Fables are on a tight budget. She also states most of them couldn't save their wealths from Fable Land when they ran away.
Even past that, had they had those they'd use them to fight the adversary. This all leads me to believe the Animal Farm acquired those weapons after they escaped, and did so in secret, so that the Fabletown didn't know.
Is it ever explained, maybe in the future volumes (I'm only on volume II), where they got the weapons from?