Viking Raids and Responses

By 851 CE, the scale of attacks escalated when 350 ships stormed London and Canterbury. This year marked a turning point, as a Viking here—a raiding army distinct from a legitimate national force—stayed over winter on the Isle of Thanet for the first time rather than returning to Scandinavia.

From Plunder to Settlement: The Danelaw

Imagine packing up your entire life to move to a hostile country—this is exactly what the Vikings did when they shifted from seasonal raiding to permanent conquest. In 865 CE, the Great Heathen Army arrived in East Anglia seeking land for permanent settlement rather than just plunder.

Their success was driven by longships with shallow draughts that could navigate rivers, allowing them to take advantage of the deeply divided Anglo-Saxon kingdoms. They established the Danelaw, a vast region in Northern and Eastern England governed by Scandinavian laws, which was administered from the military heart of the Five Boroughs (Derby, Leicester, Lincoln, Nottingham, and Stamford).

• The region was divided into administrative districts called wapentakes (roughly equivalent to Anglo-Saxon hundreds), where agreements were historically signalled by the brandishing of weapons.
• Land in the Danelaw was measured in carucates, which were the Scandinavian equivalent of the Anglo-Saxon hide.

Viking settlement brought significant agricultural and economic changes to Britain. Settlers introduced the mouldboard plough, which allowed more efficient farming of the heavy soils found in the North and East. York (Jorvik) was transformed into a major international trade hub, connecting England to Baltic amber and Arabic silver routes.

The social structure in the Danelaw featured a higher proportion of ceorls (freemen) who had more freedom to own land and change lords compared to Anglo-Saxon regions. Women in the Danelaw also enjoyed greater rights under Scandinavian law, including the ability to own property and obtain a divorce.

The Macro-Political Impact: The Birth of 'England'

The Viking invasions did more than just change local laws; they fundamentally redrew the map of Britain. Before 865 CE, England was a collection of independent kingdoms (the Heptarchy). The arrival of the Great Heathen Army caused the total collapse of the traditional kingdoms of Northumbria, East Anglia, and Mercia as their ruling dynasties were destroyed or replaced by Viking puppet kings.

Wessex emerged as the sole surviving Anglo-Saxon kingdom. This "last stand" status transformed the nature of kingship. Because there were no other English kings left to lead, the West Saxon monarchs became the focal point for all English resistance. This led to the eventual unification of the various regions into a single "England." Alfred the Great and his successors began to style themselves with the new royal title: Kings of the English, signalling a shift from ruling a tribe (the West Saxons) to ruling a unified nation.

Military Defence: Alfred the Great and the Burghal System

A castle is only as strong as the soldiers defending it. To counter the Viking threat and protect the surviving kingdom of Wessex, Alfred the Great completely restructured military defences, vastly increasing centralized royal authority.

Alfred established the burghal system, a strategic network of 30–33 fortified towns known as burhs. These defences typically featured a bank, ditch, and timber palisade, though some reused old Roman stone walls. The network was brilliantly designed so that no person in Wessex was more than 20 miles (a day’s travel) away from a place of refuge.

To ensure these towns were continuously protected, Alfred divided the fyrd (local militia) into two halves: one half farmed the land while the other served on active duty guarding the burhs. He also commissioned a national naval force using ships with over 60 oars, which were twice as long as Viking longships.

The system required a massive coordinated effort of manpower and taxation, detailed in an administrative document called the Burghal Hidage. Land was divided into units called a hide, which calculated military obligations using a specific mathematical formula:

$$1 \text{ Hide} = 1 \text{ Man} = 1 \text{ Pole of Wall}$$

Calculate the garrison size and estimated wall length for a newly established burh assigned 1,500 hides.

Step 1: Calculate the number of men required for the garrison.

• $\text{Men} = \text{Hides} \times 1$
• $\text{Men} = 1500 \times 1 = 1500$ men

Step 2: Calculate the length of the wall in poles.

• $\text{Wall length} = \text{Men} \times 1$
• $\text{Wall length} = 1500 \times 1 = 1500$ poles

Step 3: Calculate the estimated wall length in feet (1 pole is approx. 4.1 feet).

• $\text{Wall length} = \text{Poles} \times 4.1$
• $\text{Wall length} = 1500 \times 4.1 = 6150$ feet

The Burghal System in Action

The best way to test a shield is to strike it. In the 890s, the Viking leader Hastein launched massive invasion fleets that rigorously tested Alfred's new defensive network.

The burhs proved highly effective at stopping the Viking tactic of speed and surprise, forcing invaders into slow starvation sieges that they were historically poor at maintaining. This strategy of defense in depth delayed the Vikings, giving Alfred time to mobilize a mobile relief army to break the sieges, as seen successfully at Rochester (885) and Exeter (893).

Burhs were not just passive hiding places; they were offensive bases. During the Battle of Buttington (893), local garrisons mobilized independently to trap and starve Hastein's army. Similarly, when a Viking fleet attacked Chichester in 894, the town garrison launched a successful counter-attack, capturing and burning several Viking ships.

Diplomatic and Financial Responses: Danegeld

Sometimes it is cheaper to pay off a bully than to fight them, but this strategy can easily backfire. Alongside military force, Anglo-Saxon kings used diplomacy to manage the Viking threat.

The Treaty of Alfred and Guthrum (c. 886) defined physical borders and required the Viking leader Guthrum to be baptized as a Christian. It also established an equal weregild (man-price) for both Englishmen and Danes to prevent ongoing blood feuds.

Kings also resorted to paying Danegeld, a national land tax originally used by Alfred to buy time to prepare his military defences. Under Æthelred the Unready, Danegeld evolved into massive extortion payments. He paid 10,000 pounds of silver after the Battle of Maldon in 991 CE, and the payments steadily escalated from there. The decision to pay these massive tributes was often made with the advice of the witan, the king's council of nobles and clergy.

• In 1012 CE, Æthelred also introduced the heregeld, an annual tax used to pay for a standing force of Scandinavian mercenaries, such as Thorkell the Tall.
• Diplomacy occasionally broke down into violence, such as the St. Brice's Day Massacre in 1002 CE, a failed attempt by Æthelred to kill all Danes in England, which only provoked severe retaliatory raids.

By 1018 CE, King Cnut levied a "Great" Danegeld of 72,000 pounds nationally, plus an extra 10,500 pounds from London. The total payments between 991 and 1012 CE reached approximately £250,000—a staggering economic drain considering one Anglo-Saxon pound could buy 15 cows. While Æthelred's payments encouraged further raids, the urgent need to collect Danegeld forced the Anglo-Saxons to develop a highly efficient, centralized taxation and land-recording system.