The Terramort Resistance Against Gabool, otherwise known as TRAG, was a band of former oarslaves and prisoners previously held by Gabool the Wild and his searats. They were intent on destroying all that Terramort Isle stood for. It was started by Joseph the Bellmaker and Tan Loc. Later, after the final battle and the killing of Gabool, presumably all of the Trag members went on to live at Redwall Abbey.
The Terramort Resistance Against Gabool appears in Mariel of Redwall.