What is Disturbance Of Common?

Legal Definition
The doing any act by which the right of another to his common is incommoded or diminished; as where one who has no right of common puts his cattle into the land, or where one who has a right of common puis in cattle which are not commonable, or surcharges the common; or where the owner of the land, or other person, incloses or otherwise obstructs it. 3 Bl. Comm. 237241; 3 Steph. Comm. 5li, 512.
-- Black's Law Dictionary