Breaking out occasionally into armed conflicts, and among the princes of the other principalities the old struggle for precedence and territory went on unceasingly until it was suddenly interrupted, in the first half of the thirteenth century, by the unexpected irruption of an irresistible foreign foe coming from the mysterious.
The beginning of his reign was marked by a disastrous irruption of the Hungarians into Burgundy and Aquitaine (937).
The last years of the reign were troubled by fresh difficulties with Hugh the Great and also by an irruption of the Hungarians into the south of France.
In the autumn of 882 an irruption of the Normans forced the old archbishop to take refuge at Epernay, where he died on the 21st of December 882.
The wild animals of Caucasia are for the most part the same as those which frequent the mountainous parts of central Europe, though there is also an irruption of Asiatic forms, e.g.