Subscriber number Advertisement Æthelflæd: The woman who crushed the Vikings Podcast: Vikings on screen Coveted warriors This marginal illumination from the Saga of Saint Olaf shows his death at the battle of Stiklestad in 1030. (Photo by Werner Forman/Universal Images Group/Getty Images) Viking warriors looked to the god Odin to give them aggression and courage in battle, but the berserkers took this a step further. According to the sources they could rout an outnumbering force, and when they attacked they howled like mad dogs or wolves. It was said that neither iron nor fire could injure them, and they didn’t know pain. After a battle they were as weak as infants, totally spent both physically and psychologically. Brotherhood of war Read more: 8 Vikings you should know about Ragnar Lothbrok: the immortal Viking (subscription) 8 Vikings you should know about Ragnar Lothbrok: the immortal Viking (subscription) The berserkers are spoken of as fearsome enemies to meet. They were often said to be so intoxicated by battle-lust that they bit their shields, attacked boulders and trees and even killed each other while they were waiting for battles to begin. A set of chessmen from the 12th century found on the Isle of Lewis in the Scottish Hebrides includes a chess piece of a warrior biting his shield. The title of berserker is thought sometimes to have been inherited from father to son, and there are known examples of entire families of berserkers. One such family known from the sagas is Egil Skallagrimson. Egil’s father, Skallagrim (‘ugly skull’), and his grandfather Kveldulv (‘nightwolf’) were also berserkers. The concept of ‘berserk’ also turns up independently of ‘berserker’. The idea of ‘going berserk’ could apply to more than just the members of a warrior brotherhood. Harald Hardråde (Hardruler) “went berserk” at the 1066 battle of Stamford Bridge, for example. The expression is also used in relation to warriors who are not thought to have been wearing any distinctive uniform of animal skins. Olav Haraldsson’s berserkers, who wrecked the battle of Stiklestad for him, are an example of this. King Harold II, the Saxon king of Britain, beholds the body of his rebellious brother Tostig, whom he has just defeated at the battle of Stamford Bridge, 1066. (Photo by Hulton Archive/Getty Images) The heruli are said to have had a kingdom on Fyn. This may have survived until into the sixth century, but more of them had previously been driven out of Scandinavia by the Danes. The heruli often took service as warrior bands in the Roman army. They appeared in the same way as the berserkers, in small groups in the service of chieftains or kings, and there is a possibility that the origins of the berserkers may be found among the mysterious heruli. Read more: How England rode the Viking storm The great Viking terror: how Norse warriors conquered the Anglo-Saxons How England rode the Viking storm The great Viking terror: how Norse warriors conquered the Anglo-Saxons “Wolf-heathens” Battle of Hafrsfjord. (World History Archive/Alamy Stock Photo) The descriptions in the sagas of violent men and killers cannot all be linked to the berserkers, however. Distinctions are made, for example, between ‘berserkers’ and ‘warriors,’ and between ‘normal’ killers and men who fought duels. And the Old Norse saga texts never call the berserkers mad or insane. They regard the berserkers as something more than just socially problematic and unusually aggressive. The sagas distinguish them from other men by ascribing to them a particular ‘nature’ that made one both scornful and fearful of them at the same time. The mushroom theory White agaric has also been suggested as a cause of the berserk fury, but considering how poisonous this is, it is quite unthinkable that it would be eaten. Eating agaric mushrooms can lead to depression and can make the user apathetic, in addition to its hallucinogenic effects. Berserkers are certainly never described as apathetic! Poisoning with the fungus Claviceps purpurea has also been suggested – it contains a compound used to synthesise the hallucinogen LSD (lysergic acid diethylamide). However, if mushrooms had been so important for the berserkers, they would surely have been mentioned in the sagas, which they are not. The most probable explanation for ‘going berserk’ comes from psychiatry. The theory is that the groups of warriors, through ritual processes carried out before a battle (such as biting the edges of their shields), went into a self-induced hypnotic trance. In this dissociative state they lost conscious control of their actions, which are then directed subconsciously. People in this state seem remote, have little awareness of their surroundings and have reduced awareness of pain and increased muscle strength. Critical thinking and normal social inhibitions weaken, but the people affected are not unconscious. Fly Agaric mushroom. (Photo by Eye Ubiquitous/UIG via Getty Images) The Old Norse social order and religion were able to accommodate this type of behaviour, and it is understandable that the phenomenon disappeared after the introduction of Christianity. A Christian society considered such rituals and actions as demonic and thought that they must have resulted from supernatural influences. Kim Hjardar is the co-author, with Vegard Vike, of Vikings at War, which will be published in hardback in October by Casemate Books. Advertisement This article was first published on History Extra in September 2016