Shamrock,
Redwall is a "fantasy" series about an abbey of mice and other small creatures, such as hares, hedgehogs, otters, and squirrels. It's kind of hard to explain in a short post, but basically, it's usually about a warrior(who is usually a mouse) who wields the sword of Martin the Warrior(the first Redwall Abbey Warrior) against the bad guys, who are: ferrets, stoats, rats, weasels, foxes, and one or two pine martens. There is also the theme of the Badger Lords, who rule a volcano/mountain called Salamandastron, and they fight the vermin too. It's a BIG series, as a matter of fact, this September the author(Brian Jacques) will be coming out with his eighteenth!
Hope I helped