Damage feasant or faisant
Black's Law Dictionary · Henry Campbell Black, M.A. · 1910
Black's Law Dictionary
Doing damage
A term applied to a person's cattle or beasts found upon another's land, doing damage JS7 treading down the grass, grain, etc.
3 Bl. Comm. 7, 211; Tomlins.
This phrase seems to have been introduced in the reign of Edward III., in place of the older expression "en son damage," (in damno suo.) Crabb, Eng. Law, 292.