Routiers
The Hundred Years' War, which lasted from 1337 to 1453, was the backdrop to their pillaging. The Hundred Years' War was fought between two royal families over control of the French throne: the Plantagenets from England, and the House of Valois from France. The War, which is divided into three stages - the Edwardian War (1337-1360), the Caroline War (1369-1389), and the Lancastrian War (1415-1429) - saw the development of new tactics and weaponry that revolutionised warfare during that time period.
Chevauchée
The chevauchée has gained recognition for its use during the Hundred Years' War between the Kingdom of England and the Kingdom of France. It was not a new tactic and had been used many times before; for example, William the Conqueror had used the tactic before the Battle of Hastings to encourage Harold to engage in a battle. The difference was that during the Hundred Years' War the tactic was used more frequently, on a larger scale and more systematically than before.