The Hundred Years War: Summary & Key Insights

The Hundred Years War began as an argument over legitimacy wrapped in the ambitions of two royal houses. When Charles IV of France died in 1328 without a male heir, his nephew, Edward III of England, claimed the French throne through his mother, Isabella, daughter of Philip IV. The French nobility, however, invoked the Salic Law, excluding inheritance through the female line, and crowned Philip VI of Valois instead. Edward’s claim was not merely dynastic pride—it reflected England’s growing dependence on its French territories, particularly the wealthy duchy of Aquitaine. The subsequent seizure of English lands in France by Philip VI transformed what had been a feudal dispute into open war.

The geopolitical climate of Europe was equally volatile. France, a feudal web of semi-independent lordships, sought to assert royal authority, while England, increasingly centralized and confident after years of internal consolidation, aimed to protect its continental possessions. Trade in wool and wine intertwined the two economies, yet that interdependence only deepened the resentment between them. I narrate this moment as one of inevitability: the clash of two monarchies struggling to define sovereignty in an age still bound by chivalric code but already moving toward national awareness.

The early campaigns of the war brought England stunning victories that shocked the medieval world. In 1346 at Crécy, Edward III’s army, disciplined and well-armed with the deadly longbow, broke the charge of the French knights—a turning point that heralded the end of old-style chivalric warfare. I aimed to show that Crécy was not only a battle but a revelation: technology and organization, rather than noble birth, determined success. A decade later, at Poitiers, the Black Prince captured King John II of France, compelling a kingdom already reeling from famine and plague into political chaos. These victories were won not merely by chance or valor but through a deliberate reshaping of military tactics. English infantry triumphed over French cavalry, and with those triumphs came a new self-image for the English nation—an island realm of hardy commoners who could humble the proudest aristocracy in Europe.

Yet triumph carried its own costs. The devastation across northern France was immense. Mercenaries and raiders—companies of disbanded soldiers—roamed the countryside, embodying the darker face of total war. As I delved into these campaigns, I sought to balance admiration for the military skill of Edward and the Black Prince with recognition of the profound human suffering that accompanied their glory.