The Hundred Years' War lasted from 1337 to 1453 because English kings held French lands and disputed who should wear France's crown.
The Hundred Years' War was a series of wars between the kingdoms of England and France, conventionally dated from 1337 to 1453. The fighting lasted across generations, but not continuously: truces, negotiations, internal crises, raids, sieges, and major battles interrupted one another. The main issue was who should control lands in France, complicated by an English king's claim to the French throne. English victories made conquest seem possible for a time, yet France ultimately recovered almost all the territories England had held. The war also exposed ordinary communities to plunder, disrupted trade, and changed how medieval rulers raised armies and resources.
Why Did the War Begin?
For centuries, the kings of England had also possessed estates on the European mainland. By the fourteenth century, their most important surviving holdings lay in southwestern France, especially Gascony, within the broader duchy of Aquitaine. This created an awkward feudal relationship: the English king ruled England independently but held some French lands as a vassal of the French king. Each crown interpreted its rights differently. French rulers wanted firmer authority over those territories, while English rulers resisted the loss of privileges, revenues, and political control.
A separate crisis emerged when Charles IV of France died in 1328 without a surviving son. French political leaders accepted his cousin, Philip VI of the Valois line, as king. Edward III of England was also a descendant of the French royal family through his mother, Isabella, Charles IV's sister. The rival claims were not a simple modern inheritance contest: ideas about whether succession could pass through women mattered, and historians debate the ambitions behind Edward's later claim. Philip had already been crowned when Edward formally adopted the French royal title in 1340.
The immediate rupture came in 1337, when Philip declared Edward's French possessions confiscated. French support for Scotland, England's rival to the north, added tension. Flanders also mattered because its cloth-making towns relied heavily on English wool, linking warfare to commerce and diplomatic alliances. None of these causes alone explains 116 years of conflict. Territorial rights, royal legitimacy, regional allies, and the bargaining power of medieval monarchs became entangled, making compromise difficult.
The popular phrase “England versus France” is useful but incomplete. Armies could include Gascons, Bretons, Scots, Burgundians, Genoese crossbowmen, and other allies or paid soldiers. Loyalties changed by region and decade. The conflict was fought mostly on French soil and was not a straightforward struggle between two unified modern nation-states. Royal Armouries' historical overview traces this mix of dynastic, territorial, and military interests.
How Did English Armies Win Famous Battles?
Edward III achieved major early successes. England defeated a French fleet at Sluys in 1340, won a major land battle at Crécy in 1346, and captured the important port of Calais in 1347 after a prolonged siege. At Poitiers in 1356, Edward's son—often called the Black Prince—defeated the French and captured King John II. The ensuing settlement, the Treaty of Brétigny in 1360, granted England extensive territories, although the political settlement did not produce a lasting peace.
English victories are famous for the longbow, but the weapon did not win battles by itself. At Crécy, archers operated with other troops on a carefully chosen defensive position. At Agincourt in 1415, Henry V's forces used archers, protective stakes, dismounted men-at-arms, and difficult muddy ground against French attacks. Training, terrain, leadership, organization, and the mistakes of opponents mattered. Medieval armor also changed during this long period, so the equipment of a soldier in 1346 should not be treated as identical to that of a soldier in 1415.
Sieges often mattered more to territorial control than a spectacular battle. Holding a fortress or city meant securing roads, supplies, taxation, and political loyalty. Siege warfare could mean starvation for inhabitants as well as hardship for besiegers. The English crown also used destructive mounted raids, known as chevauchées, to damage resources and challenge the French king's ability to protect his subjects. These operations brought the conflict into farms and market towns far from the best-known battlefields.
War was expensive, requiring money for wages, transport, equipment, and garrisons. Both kingdoms also faced the devastating Black Death in the middle of the fourteenth century; the epidemic was not caused by the war, but it compounded the era's disruption. French forces recovered many lost positions under Charles V in the later fourteenth century. England's military superiority was therefore neither permanent nor uniform. English Heritage explains how longbows, armor, fortified sites, and early cannon shaped medieval warfare.
How Did France Finally Win?
The conflict entered another dramatic phase when Henry V returned to France in 1415. His victory at Agincourt was followed by campaigns in Normandy. French political divisions helped England: factions aligned with the Burgundian dukes clashed with supporters of the French heir, known as the Dauphin. In the Treaty of Troyes (1420), Henry was recognized as heir to Charles VI of France, displacing the Dauphin. But Henry and Charles both died in 1422, leaving the English claim resting on the infant Henry VI and his representatives.
The siege of Orléans in 1428–1429 became a turning point. Joan of Arc, who said she acted on a divine mission, helped rally French forces; the English lifted the siege in May 1429. The Dauphin was crowned Charles VII at Reims that July. Joan was captured in 1430 and executed after a church trial in 1431, but French recovery continued. Her role was important for morale and legitimacy, although victory depended on many commanders, troops, alliances, and years of campaigning—not one person alone.
A major diplomatic shift occurred in 1435, when Burgundy reconciled with Charles VII. French royal forces retook Paris the next year. More organized military resources and increasing use of gunpowder artillery strengthened the French position as the war continued. After French success at Formigny in 1450, English holdings in Normandy collapsed. The defeat of an Anglo-Gascon force at Castillon in 1453 helped end English power in Gascony. England retained Calais, which remained under English control until 1558, but its larger continental ambitions had failed.
The consequences were unequal. Much of the destruction and displacement occurred in France, while English politics were strained by military expense and eventual defeat. Some soldiers and nobles profited from ransoms and plunder, but civilians often bore enormous costs. France's monarchy emerged with stronger means to raise military resources, yet it is too simple to say that the war instantly created modern France or modern nationalism. National identity developed gradually, and medieval political loyalties remained complex.
Conclusion
The Hundred Years' War began with overlapping disputes about French territory and royal succession, then developed into intermittent warfare across more than a century. Its story cannot be reduced to a string of English battlefield victories or the heroism of Joan of Arc. The lasting outcome was a French recovery of territory and a major setback for England's claim to rule France. For readers, the central lesson is that medieval wars often revolved around dynastic rights, landholding, alliances, and the ability to sustain long campaigns—not just battles.
Sources & Further Reading
- Royal Armouries — The Hundred Years' War (1337–1453)
- English Heritage — Medieval Warfare
- World History Encyclopedia — Causes of the Hundred Years' War