Guerilla Union of Shrews in Mossflower

The Guosim is an important group of shrews that traverse Mossflower Woods and the surrounding country. They are water creatures that typically use logboats on the many streams and tributaries for transportation. An argumentive and indecisive bunch, they are nevertheless deadly in battle and never unwilling to help Redwall's residents or other good creatures, and often act as transportation, crew or bodyguards for the protagonist.

They are always led by a Log-a-Log, a tough shrew who commands the bunch and is usually a bit more laid-back and less argumentive than the average shrew. All Log-a-Logs have been male, with the exception of Grenn in Lord Brocktree. The weapons of choice for the Guosim are small, deadly rapiers, and they often wear brightly-colored headbands. They love to eat.

The Guosssom is a southern faction of the Guosim and is characterized by the usage of the Blackstone, which defines rank.

The Guoraf is another southern faction of the Guosim.

It should also be noted that in Redwall there are inconsistancies involving the Guosim; for instance, not only did the band have the name, an individual shrew was named Guosim, but this may have been because she was "president of the shrew union", a title never referred to in future books. The error was rectified in all other books.

Books
The Guosim appear in nearly every Redwall novel and the Guosssom appears in Salamandastron. The Guoraf appear in Loamhedge