The Crow Brethren was a group of vermin crows led by Krakulat. They lived in a large pine grove. After some of Swartt's Horde killed Krakulat's mother, he directed attacks on them in a rage at his mother's death. After Swartt Sixclaw had the pine grove burned down, the attacks continued in the open space as the horde marched.
The Crow Brethren Appear in Outcast of Redwall.