25 Longest Wars That Lasted for Centuries: Epic Conflicts That Shaped History
War has been humanity’s most persistent companion throughout history. While most conflicts burn hot and fast, some have smoldered for centuries, spanning dozens of generations and fundamentally reshaping entire civilizations. These marathon conflicts tell the story of our species’ most enduring struggles for territory, religion, resources, and survival.
The 25 longest wars that lasted for centuries weren’t just extended battles — they were complex, evolving conflicts that ebbed and flowed across generations. Some featured continuous fighting, while others involved periods of relative peace punctuated by renewed hostilities. What unites them all is their extraordinary duration and the profound impact they had on the societies that fought them.
Understanding these epic struggles requires us to look beyond simple start and end dates. These were dynamic conflicts that adapted to changing technologies, shifting alliances, and evolving political landscapes while maintaining their core antagonisms across centuries.
Understanding “Century-Long Wars”
Before diving into our list of the 25 longest wars that lasted for centuries, it’s crucial to understand what constitutes a “century-long war.” These conflicts fall into two main categories: continuous warfare and prolonged periods of intermittent conflict between the same primary belligerents.
Continuous warfare involved sustained military campaigns with minimal breaks in fighting. However, most century-long conflicts were actually series of related wars punctuated by temporary truces, peace treaties, and periods of reconstruction. What made them “single” conflicts was the persistence of underlying causes — territorial disputes, religious differences, or dynastic claims that repeatedly reignited hostilities.
The famous “335 Years War” between the Netherlands and the Isles of Scilly (1651-1986) often appears in discussions of long wars, but it was largely symbolic with no actual combat after its initial phase. For our purposes, we’re focusing on conflicts that involved actual warfare and significant impact over their duration.
These extended conflicts were shaped by geographical factors that made complete conquest difficult, technological limitations that prevented decisive victories, and deep-seated cultural or religious differences that couldn’t be easily resolved through diplomacy.
The 25 Longest Wars That Lasted for Centuries
1. Reconquista (718-1492) — 774 Years
Belligerents: Christian kingdoms of Iberia vs. Islamic Moorish states
The Reconquista stands as the longest documented military campaign in European history. Beginning with the Islamic conquest of Iberia in 711 CE, Christian resistance started almost immediately in the northern mountains. The conflict evolved from desperate survival battles to systematic campaigns of reconquest, featuring legendary figures like El Cid and culminating in the fall of Granada in 1492. This wasn’t continuous warfare but rather centuries of raids, sieges, and territorial exchanges that gradually pushed Islamic rule southward. The Reconquista fundamentally shaped Spanish and Portuguese identity, established the template for later colonial expansion, and created a deeply religious warrior culture that would influence European history for centuries.
2. Anglo-French Wars (1109-1815) — 706 Years
Belligerents: England/Great Britain vs. France
This series of conflicts began when Henry I of England contested French territorial claims and ended only with Napoleon’s final defeat at Waterloo. The wars included famous conflicts like the Hundred Years’ War, the War of Spanish Succession, and the Napoleonic Wars. These weren’t constant battles but recurring cycles of warfare driven by dynastic claims, colonial competition, and struggles for European hegemony. The conflicts shaped both nations’ development, created enduring military traditions, and ultimately established Britain as a global maritime power while contributing to the French Revolution through financial strain.
3. Roman-Persian Wars (54 BC-628 AD) — 681 Years
Belligerents: Roman Empire/Byzantine Empire vs. Parthian Empire/Sasanian Empire
These conflicts began when Crassus invaded Parthia and continued through the rise and fall of the Sasanian dynasty. The wars were fought primarily over control of Mesopotamia and Armenia, with shifting frontiers that rarely changed dramatically despite massive expenditures of resources. Both empires developed sophisticated siege techniques and military technologies in response to these prolonged conflicts. The wars featured famous battles like Carrhae and sieges of major cities, but their most significant impact was mutual exhaustion that left both empires vulnerable to the rapid Arab expansion of the 7th century.
4. Byzantine-Bulgarian Wars (680-1355) — 675 Years
Belligerents: Byzantine Empire vs. First and Second Bulgarian Empires
Beginning with Bulgar settlement south of the Danube, these wars defined the medieval Balkans. The conflicts saw periods of Bulgarian dominance, including the reign of Simeon the Great who nearly captured Constantinople, alternating with Byzantine resurgence under emperors like Basil II “the Bulgar Slayer.” The wars involved complex diplomacy with other regional powers, religious conversion struggles, and the development of Slavic Orthodox culture. The First Bulgarian Empire’s destruction by Basil II was followed centuries later by the Second Bulgarian Empire’s rise, continuing the cycle of conflict until Ottoman conquest ended Bulgarian independence.
5. Roman-Germanic Wars (113 BC-476 AD) — 588 Years
Belligerents: Roman Republic/Empire vs. Various Germanic tribes
These conflicts began with the Cimbrian War and climaxed with the fall of Rome itself. Unlike other wars on this list, these battles gradually shifted from Roman expansion into Germania to desperate defense of imperial frontiers. The wars featured legendary encounters like the Battle of Teutoburg Forest, where Arminius annihilated three Roman legions, and countless border skirmishes along the Rhine and Danube. Germanic military pressure intensified during the Migration Period, with tribes like the Visigoths, Vandals, and Ostrogoths eventually carving out kingdoms within former Roman territory. The conflicts fundamentally transformed European civilization and marked the transition from antiquity to the medieval period.
6. Arab-Byzantine Wars (629-1180) — 551 Years
Belligerents: Rashidun, Umayyad, and Abbasid Caliphates vs. Byzantine Empire
Beginning shortly after Prophet Muhammad’s death, these wars witnessed the rapid Islamic expansion that stripped Byzantium of its richest provinces. The conflicts included the Arab conquest of Syria, Egypt, and North Africa, followed by centuries of raids and counter-raids across Anatolia. Notable campaigns included the Arab sieges of Constantinople and the Byzantine recovery under the Macedonian dynasty. The wars saw technological innovations like Greek fire and evolved from Arab expansion to frontier warfare as both empires reached their natural limits. These conflicts shaped the religious and cultural boundaries between Christianity and Islam that persist today.
7. Yaqui Wars (1533-1929) — 396 Years
Belligerents: Yaqui people vs. Spanish colonial forces, later Mexican government
The Yaqui people of Sonora maintained one of the longest resistance campaigns against European colonization in the Americas. Spanish conquistadors first encountered fierce Yaqui resistance in 1533, leading to nearly four centuries of intermittent warfare. The Yaqui developed sophisticated guerrilla tactics, utilizing their knowledge of desert terrain to resist both Spanish and Mexican attempts at subjugation. The conflicts intensified during the Mexican Porfiriato when the government attempted forced relocation and cultural assimilation. The wars finally ended in 1929 when Mexico granted the Yaqui limited autonomy and land rights, though tensions persisted long after formal peace.
8. Yemeni-Ottoman Conflicts (1538-1911) — 373 Years
Belligerents: Ottoman Empire vs. Various Yemeni rulers and tribes
The Ottoman conquest of Yemen in 1538 began a turbulent relationship that never achieved stable control. Yemen’s mountainous terrain, tribal structure, and fierce independence tradition made it nearly impossible to govern from Constantinople. The conflicts featured periodic Yemeni uprisings led by Zaydi imams, temporary Ottoman withdrawals, and costly reconquest campaigns. The Ottomans struggled to balance local autonomy with imperial authority, leading to a cycle of rebellion and reoccupation. These wars drained Ottoman resources and demonstrated the limits of imperial power in difficult terrain, ultimately contributing to the empire’s decline.
9. Moroccan-Portuguese Conflicts (1415-1769) — 354 Years
Belligerents: Portuguese Empire vs. Moroccan dynasties
Beginning with Portugal’s conquest of Ceuta in 1415, these conflicts centered on control of North African coastal cities and Atlantic trade routes. The Portuguese established a chain of fortified ports along the Moroccan coast, leading to constant warfare with Marinid, Wattasid, and Saadian rulers. The conflicts reached their climax at the Battle of Alcácer Quibir in 1578, where King Sebastian of Portugal died and his army was destroyed, leading to the Portuguese succession crisis. Despite this disaster, fighting continued as Portugal attempted to maintain its remaining North African possessions until finally abandoning them in the 18th century.
10. Russo-Turkish Wars (1568-1918) — 350 Years
Belligerents: Russian Empire vs. Ottoman Empire
These twelve distinct wars represented one of history’s most persistent international rivalries. Beginning with Ivan the Terrible’s campaigns and ending with World War I, the conflicts were driven by Russian expansion toward warm-water ports and Orthodox Christian solidarity with Balkan peoples under Ottoman rule. Major wars included Catherine the Great’s campaigns that secured Crimea and the devastating conflicts of the 19th century that gradually dismembered Ottoman Europe. The wars featured siege warfare, massive battles like Sinope, and diplomatic interventions by other European powers. They fundamentally reshaped the balance of power in Eastern Europe and the Near East.
11. Arauco War (1536-1883) — 347 Years
Belligerents: Spanish colonial forces, later Chilean army vs. Mapuche people
The Mapuche people of central Chile maintained their independence longer than any other indigenous group in the Americas. Spanish attempts at conquest began in 1536 but faced fierce resistance from Mapuche warriors who adapted European military techniques while maintaining their traditional strategies. The conflict featured legendary figures like Lautaro and Galvarino, and established a relatively stable frontier that lasted centuries. Even after Chilean independence, the new republic continued the war, finally achieving military victory in 1883. The Mapuche resistance became a symbol of indigenous defiance and influenced Chilean national identity.
12. Dano-Swedish Wars (1470-1814) — 344 Years
Belligerents: Denmark-Norway vs. Sweden
These conflicts emerged from Sweden’s struggle to break free from the Kalmar Union and continued as both kingdoms competed for Baltic supremacy. The wars included the devastating conflicts of Gustavus Adolphus, the Great Northern War, and numerous smaller campaigns for control of southern Sweden and Norwegian territory. The conflicts reshaped Scandinavian political geography, with Sweden emerging as a great power before eventually losing most of its Baltic empire. The wars ended with the Treaty of Kiel in 1814, which transferred Norway to Sweden and established the modern Scandinavian political order.
13. Spanish-Moro Conflict (1565-1898) — 333 Years
Belligerents: Spanish colonial forces vs. Moro peoples of the southern Philippines
Spanish colonization of the Philippines met fierce resistance from the Muslim peoples of Mindanao and the Sulu Archipelago. The Moro possessed advanced maritime technology, fortified settlements, and strong Islamic identity that motivated centuries of resistance. Spanish forces established presidios and conducted periodic campaigns but never achieved complete control over Moro territory. The conflicts featured naval battles, siege warfare, and slave raiding by both sides. Spanish rule remained tenuous in Moro areas until the end of the colonial period, when the conflict transferred to American forces.
14. Apache-Mexico Wars (1600-1915) — 315 Years
Belligerents: Apache tribes vs. Spanish colonial forces, later Mexican government
Apache resistance to European colonization began with early Spanish settlements in the American Southwest and continued through Mexican independence and into the 20th century. The Apache developed highly effective guerrilla tactics, using their knowledge of desert terrain to launch raids and evade pursuit. Spanish and Mexican forces struggled to protect settlements and trade routes from Apache attacks, leading to cycles of warfare, temporary truces, and renewed hostilities. The conflicts intensified during the 19th century as Mexican weakness and American expansion disrupted traditional patterns, with some Apache groups continuing resistance until 1915.
15. American Indian Wars (1609-1924) — 315 Years
Belligerents: European colonists, later United States vs. Various Native American tribes
This broad category encompasses hundreds of distinct conflicts between European settlers and indigenous peoples across North America. Beginning with early colonial skirmishes in Virginia, the wars evolved from local conflicts over resources to systematic campaigns of conquest and displacement. Major conflicts included King Philip’s War, the French and Indian Wars, and the Plains Indian Wars. The wars featured diverse Native American strategies, from Tecumseh’s pan-Indian confederacy to the guerrilla tactics of leaders like Geronimo. The conflicts fundamentally transformed the North American continent and resulted in the displacement and cultural disruption of hundreds of tribal nations.
16. Ottoman-Persian Wars (1514-1823) — 309 Years
Belligerents: Ottoman Empire vs. Safavid, Afsharid, and Qajar Persia
These conflicts emerged from the Ottoman-Safavid rivalry over control of Mesopotamia, the Caucasus, and eastern Anatolia. Religious differences between Sunni Ottomans and Shia Persians added ideological intensity to territorial disputes. The wars featured massive siege campaigns, with cities like Baghdad changing hands multiple times, and cavalry battles across the Iranian plateau. Both empires developed sophisticated military technologies and administrative systems in response to prolonged warfare. The conflicts ended with relatively stable borders that largely persist today, though they left both empires weakened and vulnerable to European expansion.
17. Burmese-Siamese Wars (1547-1855) — 308 Years
Belligerents: Burma (Myanmar) vs. Siam (Thailand)
These conflicts began during the rise of the Toungoo dynasty in Burma and continued through multiple Burmese invasions of Siam. The wars featured elaborate siege warfare, elephant cavalry, and complex diplomacy involving other regional powers like China and European trading companies. The conflicts reached their climax during the 18th century when Burma conquered the Siamese capital Ayutthaya but failed to establish permanent control. Siamese recovery under the Chakri dynasty led to successful resistance against later Burmese invasions. The wars established the approximate borders between modern Myanmar and Thailand and shaped the cultural development of both nations.
18. Han-Xiongnu War (200 BC-91 AD) — 290 Years
Belligerents: Han Dynasty China vs. Xiongnu Confederation
This conflict began when the first Han emperor was defeated and surrounded by the Xiongnu leader Modu Chanyu, leading to a humiliating tribute arrangement. The wars evolved from defensive measures to massive offensive campaigns under Emperor Wu, who launched expeditions deep into the steppes. The conflicts featured innovative military tactics, including the development of Han cavalry to match Xiongnu mobility, and diplomatic initiatives like the marriage alliances of the heqin system. Chinese victory came through a combination of military pressure, diplomatic division of the Xiongnu confederation, and environmental factors that weakened nomadic society.
19. Navajo Wars (1600-1866) — 266 Years
Belligerents: Spanish colonial forces, later Mexican and U.S. armies vs. Navajo Nation
Navajo resistance began with Spanish colonization of New Mexico and continued through Mexican rule and American conquest. The conflicts were characterized by raids and counter-raids, with Navajo warriors adapting European horses and weapons while maintaining traditional tactics. Spanish and Mexican forces established presidios but never achieved lasting control over Navajo territory. The wars intensified after American conquest, culminating in Kit Carson’s devastating campaign and the “Long Walk” forced relocation to Bosque Redondo. The conflicts ended with the 1868 treaty that established the Navajo reservation, though tensions continued for decades.
20. Ottoman-Habsburg Wars (1526-1791) — 265 Years
Belligerents: Ottoman Empire vs. Habsburg Monarchy (Austria)
These conflicts began with Ottoman expansion into Central Europe after their victory at Mohács and continued through multiple generations of warfare. The wars featured famous sieges like Vienna (1529 and 1683), massive battles such as Saint Gotthard, and complex diplomacy involving other European powers. The conflicts saw the Ottoman Empire reach its maximum European expansion before gradually retreating under Habsburg pressure. Military innovations included Ottoman engineering expertise and Habsburg improvements in artillery and fortification. The wars established the approximate boundary between the Islamic and Christian worlds in Europe and contributed to the development of modern European diplomacy.
21. Byzantine-Ottoman Wars (1265-1479) — 214 Years
Belligerents: Byzantine Empire vs. Ottoman Empire
These conflicts chronicled the slow decline and ultimate conquest of the thousand-year Byzantine Empire by the rising Ottoman power. Beginning with Ottoman raids into Byzantine Anatolia, the wars gradually stripped Byzantium of all its territory except Constantinople and a few scattered holdings. The conflicts featured desperate Byzantine attempts to secure Western aid, Ottoman innovations in siege warfare, and the ultimate triumph of Ottoman military superiority. The fall of Constantinople in 1453 marked the end of the Roman Empire and symbolized the transition from medieval to early modern history.
22. Polish-Teutonic Wars (1308-1521) — 213 Years
Belligerents: Kingdom of Poland/Polish-Lithuanian Commonwealth vs. Teutonic Knights
These conflicts began when the Teutonic Knights conquered Polish territories in Pomerania and continued through the gradual Polish reconquest of these lands. The wars featured the massive Battle of Grunwald in 1410, one of medieval Europe’s largest engagements, where Polish-Lithuanian forces decisively defeated the Teutonic Knights. The conflicts combined territorial disputes with religious tensions between Catholic Poland and the military order. Polish victory led to the gradual secularization of Teutonic territories and their eventual incorporation into the Polish-Lithuanian Commonwealth.
23. Roman Conquest of Iberian Peninsula (218 BC-19 BC) — 199 Years
Belligerents: Roman Republic/Empire vs. Various Iberian tribes and Carthaginian forces
This protracted conquest began during the Second Punic War when Romans expelled Carthaginians from Spain and continued through centuries of tribal resistance. The wars featured the desperate defense of Numantia, Lusitanian guerrilla warfare under leaders like Viriathus, and the final Cantabrian Wars that completed Roman conquest. These conflicts demonstrated Roman persistence in the face of determined resistance and established patterns of conquest and administration that would characterize later imperial expansion. The prolonged nature of these wars showed that Roman military superiority did not guarantee rapid conquest of determined opponents.
24. Russian Conquest of Siberia (1580-1750) — 170 Years
Belligerents: Russian Empire vs. Various Siberian peoples and the Khanate of Sibir
Beginning with Yermak’s expedition across the Urals, this conquest represented one of history’s largest territorial expansions. The conflicts involved numerous indigenous peoples who resisted Russian expansion with varying degrees of success. Russian forces combined Cossack mobility with firearms technology to gradually establish control over vast territories. The wars featured sieges of native strongholds, battles in extreme climates, and complex negotiations with tribal leaders. This expansion established Russia as a Eurasian empire and provided the economic foundation for later Russian power through fur trade revenues.
25. Hundred Years’ War (1337-1453) — 116 Years
Belligerents: Kingdom of England vs. Kingdom of France
Despite its name suggesting exactly one century, this famous conflict actually lasted 116 years across five distinct phases. The war began with Edward III’s claim to the French throne and evolved into a struggle over English continental possessions. The conflicts featured revolutionary military innovations like the English longbow victories at Crécy and Agincourt, the rise of professional armies, and the emergence of national consciousness in both countries. Joan of Arc’s intervention marked the turning point toward French victory. The war established France as Europe’s dominant land power while forcing England to develop its maritime capabilities.
The Legacy of Endless Conflict
These 25 longest wars that lasted for centuries reveal fundamental patterns about human conflict and civilization. Geography often determined duration — mountainous terrain, vast distances, and natural barriers made complete conquest nearly impossible. Cultural and religious differences provided enduring motivation that transcended individual rulers and dynasties. Technological limitations meant that decisive victories were rare, while economic constraints forced periodic truces that allowed conflicts to smolder for generations.
The human cost of these prolonged conflicts was staggering. Entire populations grew up knowing only war, developing cultures and institutions shaped by perpetual conflict. Yet these same wars also drove innovation in military technology, diplomacy, and statecraft. They created the political boundaries, cultural identities, and institutional frameworks that shaped the modern world.
These marathon conflicts demonstrate that some human disagreements prove remarkably resistant to resolution. Whether driven by competing claims to territory, irreconcilable religious differences, or fundamental cultural incompatibilities, certain disputes seem to regenerate across centuries. Understanding this pattern remains relevant as we grapple with contemporary conflicts that show similar persistence.
Conclusion
The 25 longest wars that lasted for centuries represent humanity’s most enduring struggles, spanning from ancient times to the modern era. These conflicts shaped the rise and fall of empires, established cultural boundaries that persist today, and demonstrated the extraordinary persistence of human conflict when fundamental interests clash.
From the 774-year Reconquista that forged Spanish identity to the 116-year Hundred Years’ War that created English and French nationalism, these epic struggles remind us that some conflicts transcend individual lifetimes to become multigenerational sagas. They transformed continents, displaced millions, and consumed the resources of entire civilizations while paradoxically driving innovations that advanced human knowledge and capability.
These century-spanning wars offer sobering lessons about the nature of human conflict and the importance of addressing root causes rather than symptoms. They stand as monuments to both human stubbornness and resilience — testament to our species’ capacity for both prolonged conflict and ultimate adaptation.