There are several clues that lead's to Martin's sword - Matthias and friends solves the puzzle. The Sword is on the weathervane of the Redwall Abby but the group soon learns it's not there anymore. The sparrows of the Abby fight with then capture Matthias where he learns the sparrow king has Martin's scabbard but not the sword - the sword is with the cruel snake Asmodeus.
7/10.
7/10.