_"A.D. 876. This year Rolla [Rollo] penetrated Normandy with his army; and he reigned fifty winters. And this year the army stole into Wareham, a fort of the West-Saxons. The king afterwards made peace with them; and they gave him as hostages those who were worthiest in the army; and swore with oaths on the holy bracelet, which they would not before to any nation, that they would readily go out of his kingdom. Then, under colour of this, their cavalry stole by night into Exeter. The same year Healfden divided the land of the Northumbrians; so that they became afterwards their harrowers and plowers.
A.D. 876. And in this same year the army of the Danes in England swore oaths to King Alfred upon the holy ring, which before they would not do to any nation; and they delivered to the king hostages from among the most distinguished men of the army, that they would speedily depart from his kingdom; and that by night they broke."_
The Anglo-Saxon Chronicle on the momentous year A.D. 876.