A gendarme was a heavy cavalryman of noble birth, primarily serving in the French army from the Late Middle Ages to the Early Modern period. Heirs to the knights of French medieval feudal armies, French Gendarmes also enjoyed a stellar reputation and were regarded as the finest European heavy cavalry force until the decline of chivalric ideals largely due to the ever-evolving developments in gunpowder technology. They provided the Kings of France with a potent regular force of armored lancers which, when properly employed, dominated late medieval and early modern battlefields. Their symbolic demise is generally considered to be the Battle of Pavia, which inversely is seen as confirming the rise of the Spanish Tercios as the new dominant military force in Europe. The word gendarme derives originally from the French homme d'armes (man-at-arms), plural of which is gens d'armes. The plural sense was later shortened to gendarmes and a singular made of this, gendarme. Like most fifteenth-century sovereigns, the Kings of France sought to possess standing armies of professionals to fight their incessant wars, most notable of which was the Hundred Years War. By that period, the old form of feudal levy had long proven inadequate and had been replaced by various ad hoc methods of paying vassal troops serving for money rather than simply out of feudal obligation, a method that was heavily supplemented by hiring large numbers of out-and-out mercenaries. These methods, though improvements on the old annual 40-day service owed by knights (the traditional warrior elites of Medieval Europe), were also subject to strain over long campaigns. During periods of peace they also resulted in social destabilization, as the mercenary companies—referred to in this period as routiers—refused to disband until granted their back-pay (which was invariably hopelessly in arrears), and generally looted and terrorized the areas they occupied.