June 8, 793 · Northumbria, England Theater

On June 8, 793, longships appeared without warning off the coast of Holy Island and Norse warriors stormed the monastery of Lindisfarne — one of the most sacred sites in Christendom, home to the relics of Saint Cuthbert and the magnificent Lindisfarne Gospels. The monks were killed, captured for slavery, or drowned. The church was stripped of its treasures. The attack was so sudden, so far outside the existing mental map of threats, that the scholar Alcuin of York wrote to King Æthelred of Northumbria in a state of theological bewilderment: 'Never before has such terror appeared in Britain. Behold, the church of St. Cuthbert spattered with the blood of the priests of God, despoiled of all its ornaments.'

March 845 · West Francia (modern France) Theater

A fleet of 120 Viking longships and 5,000 warriors sailed up the Seine in March 845, brushing aside the Frankish forces sent to stop them at the river crossing. Ragnar, the Norse commander, demonstrated a defining Viking tactical innovation: when Charles the Bald divided his army to defend both banks simultaneously, Ragnar chose one side, destroyed it, and hanged 111 captives from trees on the opposite bank to terrorize the survivors into retreat. The Norse force reached Paris itself — then a small island settlement on the Seine — and plundered the city. Charles paid 7,000 pounds of silver to make them leave.

Autumn 865 · Northumbria and East Anglia, England Theater

In autumn 865, a force unlike anything previously seen in England landed in East Anglia — not the hit-and-run raiding parties of the previous decades but a large, organized army apparently intended to conquer and settle rather than plunder and withdraw. The Norse sagas call it the 'Great Heathen Army.' It spent the winter in East Anglia before marching north in 866 to take York (Jorvik), the capital of Northumbria, exploiting a civil war between rival Northumbrian kings. When those kings attempted to retake York the following spring, their combined force was shattered. Northumbria became a Viking kingdom. The army then turned south toward East Anglia, where King Edmund refused to share his kingdom and was captured, tied to a post, shot with arrows until he was 'bristling like a hedgehog,' and beheaded. He was later canonized as a martyr.

c. 872 · Hafrsfjord, western Norway Theater

Harald Fairhair's consolidation of Norway under a single crown culminated in the naval battle of Hafrsfjord, fought in the fjords near modern Stavanger. A coalition of petty kings and powerful jarls who resisted Harald's expansion from Vestfold gathered their longships and confronted him. The battle was a Viking naval engagement of the classic type: longships roped together in lines, crews fighting across the gunwales in hand-to-hand combat, with the decisive moment coming when Harald's forces boarded and cleared the enemy flagships. The coalition was broken; Harald's opponents chose emigration over submission, sailing west to Iceland, the Faroe Islands, and Ireland.

May 878 · Wiltshire, England Theater

In January 878, the Danish king Guthrum launched a surprise winter attack on Alfred's Wessex — the last independent English kingdom — while Alfred was at the Christmas feast at Chippenham. Alfred escaped with a small retinue into the Somerset marshes, from which the legend of his hiding and burning the cakes derives. For months he was a fugitive in his own kingdom, rebuilding his forces from a base at Athelney. In May he emerged, assembled the fyrd (militia) of Somerset, Wiltshire, and Hampshire, and defeated Guthrum at Edington in a pitched battle that ended with the Danish army besieged at Chippenham for two weeks until they surrendered. Guthrum agreed to convert to Christianity, with Alfred as his godfather. The subsequent Treaty of Wedmore established the boundaries of the Danelaw.

November 885 – October 886 · West Francia (modern France) Theater

The largest Viking assault on France: a fleet estimated at 700 ships and 30,000 warriors arrived at Paris in November 885 and found the city refusing to yield passage up the Seine. Count Odo of Paris and Bishop Gozlin organized one of the most determined defenses of the Viking Age, holding the bridges for nearly a year against repeated Norse assaults. The Vikings built siege engines, launched fire ships, attempted to divert the river, and repeatedly stormed the bridges. The defenders held. Emperor Charles the Fat arrived with a relief army in autumn 886 — and paid the Vikings 700 pounds of silver to leave, allowing them to travel upriver to raid Burgundy. The defenders who had held for a year were furious. Odo's reputation made him King of France.

November 891 · River Dyle, modern Belgium Theater

After a decade of devastating raids across Francia, a Norse Great Army settled into a fortified camp on the River Dyle in what is now Belgium. Arnulf of Carinthia, King of East Francia, approached with his army and did something unexpected: he ordered his cavalry to dismount and attack the Norse camp on foot. The Frankish forces stormed the camp directly, killing enormous numbers of the Norse defenders. It was the most complete Frankish military victory over a Norse force in decades, and it effectively ended the Great Army's operations in Francia. Contemporary accounts claim the Frankish cavalry charged on horseback into the river to cross — a feat of audacity that the Norse camp had apparently considered impossible.

August 10–11, 991 · Maldon, Essex, England Theater

The Norse force besieged Maldon across a tidal causeway, and Ealdorman Byrhtnoth committed an act of legendary chivalry — or catastrophic tactical error — by allowing the Norse army to cross to his side rather than holding the narrow causeway where numbers meant nothing. The subsequent battle was a straight fight on open ground, which the Norse won after Byrhtnoth was killed. The Battle of Maldon survives in an Old English poem of the same name, one of the great texts of Anglo-Saxon literature, which celebrates the English warriors who died fighting to avenge their lord rather than flee. The line spoken by the veteran Byrhtwold — 'Will shall be sterner, heart the keener, spirit the greater, as our power lessens' — is among the most quoted in medieval English literature.

c. 1000 · Vinland (L'Anse aux Meadows, Newfoundland) Theater

Around the year 1000, Leif Eriksson led a Norse expedition from Greenland westward and made landfall in a place he called Vinland — almost certainly the northern tip of Newfoundland, where the Norse settlement at L'Anse aux Meadows was excavated and confirmed in 1960. The sagas describe a wooded land with abundant salmon and wild grapes (or berries — the identification of 'vin' is disputed). Subsequent expeditions attempted permanent settlement. Thorfinn Karlsefni led a colonization attempt of 65 men that lasted two to three years before conflicts with the indigenous people (called Skrælings) forced withdrawal. The Norse had reached North America five centuries before Columbus, but without the numbers or technology to hold what they found.

October 18, 1016 · Essex, England Theater

The final battle of Cnut's conquest of England was a brutal engagement at Ashingdon in Essex between Cnut's Danish army and Edmund Ironside's English forces. Edmund had fought Cnut to a standstill through a remarkable series of battles in 1016, recovering much of England from Danish control. At Ashingdon, the English position collapsed when Eadric Streona, the Ealdorman of Mercia — one of the most reviled figures in Anglo-Saxon history — defected with his forces mid-battle. The English were routed; most of their nobility was killed. Edmund survived, and the two kings agreed to divide England between them at the Treaty of Olney. Edmund died shortly afterward, almost certainly of wounds or illness, though medieval sources suspected murder. Cnut became King of all England.

July 29, 1030 · Stiklestad, Trøndelag, Norway Theater

Olaf II Haraldsson — who had forcibly Christianized Norway and alienated the powerful Norwegian chieftain class with his heavy-handed rule — was driven into exile in 1028 when Cnut of Denmark invaded and the Norwegian lords defected to him. Olaf returned from Russia in 1030 with a small force and was met at Stiklestad by a much larger army of Norwegian peasants and chieftains fighting for Cnut. He was killed in the battle. Within a year, Norwegian opinion had reversed: the Danish-backed regent was seen as oppressive, Olaf's relics were performing miracles, and the Archbishop of Nidaros declared him a saint. He was canonized as Saint Olaf within twelve months of his death — one of the fastest canonizations in medieval history.

September 25, 1066 · East Yorkshire, England Theater

Harald Hardrada — the last great Viking warrior-king, a veteran of the Byzantine Varangian Guard and thirty years of campaigns from the Black Sea to Scotland — invaded northern England with 300 ships and 9,000 men, defeated the northern English earls at the Battle of Gate Fulford, and settled at Stamford Bridge awaiting the city of York's surrender. Harold Godwinson marched his army from London to Yorkshire in four days — one of the great forced marches of medieval warfare — and appeared at Stamford Bridge before the Norse force expected him. The Norse, spread out and many without armor on a warm late-summer day, were caught off balance. Harald Hardrada was killed by an arrow in the throat. Tostig (Harold's traitorous brother) was killed shortly after. The Norwegian army was shattered; of the 300 ships that had arrived, only 24 were needed to carry the survivors home.