When in deepest winter the storm howls, so people believed, a spectral host rides through the night: the Wild Hunt. At its head rides a one-eyed huntsman on a grey steed – Odin himself. It is one of the most enduring legends of all, alive from the far North down to the Eifel.
In the North the phenomenon is called Oskoreia („Asgardreia“, the ride of the Asgard host) or Julereia. In Germany it is known as the Wild Hunt or the Raging Host – led by Wotan (the continental Odin), and in later folk belief by figures such as Frau Holle or anonymous „wild huntsmen“. The time of the hunt is the Yuletide nights (Raunächte) between the Yule feast and Epiphany, when the boundary between the worlds is thin.
The hunt is a host of the dead: fallen warriors, restless souls, hounds and steeds that roar through the air with a great din. Whoever meets it does well to throw themselves flat on the road and keep silent. Some tales tell that anyone who answers cheekily or laughs along is swept up, or has a piece of carrion thrown to them that turns to gold by morning – or the other way round. At the same time the ride counted as a blessing: where the hunt passes over the fields, the coming year will be fruitful.
„Wôdan rides in the Twelve Nights –
hear the storm, then shut the door.“
— after German folk belief (rendered in sense, handed down in the public domain)

Odin (Wotan) · The Harii – the ghost host · Valhalla & the Einherjar · The Germanic tribes · Blót calendar & Yuletide nights.
Jacob Grimm, Deutsche Mythologie (1835, public domain). Peterborough Chronicle (1127). Norwegian Oskoreia tradition. German public-domain Edda translation: Karl Simrock (1851). Scholarship: Rudolf Simek, Dictionary of Northern Mythology; critical on the continuity question: Walter Pohl and others. Regional legends: Rhenish and Eifel legend collections of the 19th century.