The Cats In Krasinski Square: 07/11/15
The Cats In Krasinski Square by Karen Hesse is a picture book based on a real event that happened at the train station in Warsaw during WWII. Cats were used to distract the Gestapo's dogs.
Hesse's picture book, though, sets the stage for an otherwise short anecdote. Her protagonist is a girl living with her sister just outside the ghetto as they are blonde and can pass as Aryan Germans. They help smuggle food, when they can, in through the cracks of the hastily built wall defining the ghetto. They have also taken to caring for the cats left behind in the forced relocations of the Jews.
It is in caring for the cats and smuggling the food that they come up with an idea to thwart a plan by the gestapo to arrest the smugglers meeting a train at the station.
Rather than rehash the story, I'd like to point you to a very thorough and thoughtfully written review on The Children's War Blog.