Here is a list of all the redwall books out in the market today. Mabey someday I'll get around to making All of these links so you can find detailed info on each of them but until then this is what I have.

Redwall (1986)
Mossflower (1988)
Mattimeo (1989)
Mariel of Redwall (1991)
Salamandastron (1992)
Martin the warrior (1993)
The Bellmaker (1994)
Outcast of Redwall (1995)
        The Great Redwall Feast (1996)
    Pearls of Lutra (1996)
    The Long Patrol (1997)
Marlfox (1998)