By Chris Dyer For Mailonline
Published: 02:20 GMT, 18 February 2020 | Updated: 02:25 GMT, 18 February 2020
Viking warriors were fuelled by a hallucinogenic herbal tea as they went on blood-thirsty raids across northern Europe, scientists claim.
The warrior culture of the Scandinavian Middle Ages was marked by Norse skirmishes with their neighbouring communities, that often involved looting and pillaging.
Elite fighters, known as berserkers who went into battle without traditional armour, entered into a state of animalistic frenzy before fighting, according to historians.
It is said that after the battles finished their anger subsided. Now scientists believe the secret behind their fearless rampages were mind-bending hallucinogens.
Known as 'stinking henbane', which is otherwise poisonous, the plant caused the warriors to strip naked for battle and launch into a frenzied attack.