They regularly made a living by plunder when they were not employed; in France they were called routiers and écorcheurs and operated outside the highly structured law of arms.
These troops of seasoned mercenaries were organized and mobile, a valuable advantage during the battles of the time, and were important elements of the armies of Henry II of England and his son, Richard I.
During the Hundred Years War between England and France there were intermittent hostilities punctuated by periods of truce, when soldiers would be laid off en masse.
The Tards-Venus (late-comers), led by Seguin de Badefol, ravaged Burgundy and Languedoc and even defeated the forces of the Kingdom of France at the Battle of Brignais in 1362.
Brigands were recruited from all nations, but mainly from troops dismissed from the army of Edward III of England after the peace treaty of Brétigny.
On October 24, 1360, after the Treaty of Calais ratified the ceasefire of 8 May, Edward III had ordered the evacuation of English troops from fortresses in many parts of France.
These bands of brigands occupied and ransomed towns such as Saint-Arnoult, Gallardon, Bonneval, Cloyes, Étampes, Châtres, Montlhéry, Pithiviers-en-Gatinais, Larchant, Milly-la-Forêt, Château-Landon, and Montargis.
The Bretons and the English in Dauphiné were companies which operated from 1374 to 1411, and accompanied the Counts of Armagnac, Turenne, and Duguesclin during their conflicts in Provence and Italy, which brought about the Great Schism between the popes of Avignon and Rome.