Mossflower, Published in 1988 by Brian Jacques, Philomel Books

"Generations before the building of Redwall Abbey, all Mossflower bowed to the will of Tsarmina - the wildcat Queen of a Thousand Eyes. With unrelenting cruelty, her ruthless army terrorizes the woodlands - until the fabled coming of Martin the Warrior. A remarkable mouse, Martin vowed to end forever the evil feline's oppressive reign - journeying to the perilous Mountain of Dragons to reforge a mighty weapon...and to prepare for the terrible battle that would mean the salvation - or destruction - of Mossflower Woods."

This book goes way back before Redwall Abbey. It shoes the courage of Matin, and it explains why Redwall creatures would look to his guidance thousands of seasons later.