| 865 | | The 'Great Army' invade |
| | | A large army of Danes landed in East Anglia led by King Ivar the 'Boneless' and King Halfdan. No attempts were made to get rid of the invaders. |
| 866 | | Vikings driven out of Ireland |
| | | Vikings raiders were driven from the northern coasts of Ireland by Aed Finliath. |
| | The 'Great Army' arrive in East Anglia |
| | | A large number of Vikings landed in East Anglia and gathered horses and supplies from the surrounding areas in preparation for their assult on Northumbria. Their leaders were Ivar the Boneless, son of Ragnar Lodbrok, and possibly Anlaf (Olaf) Cuaran, the King of Dublin. |
| Winter | Northumbria is invaded by the Danes |
| | | The 'Great Army' moved north from their original landing site in East Anglia and into Northumbria. The Army split is two. One section took boats up the coast and sailed into the Humber while the other section went overland. |
| 867 | | The Danes invade Northumbria and York |
| | | The Danes led by the sons of Ragnar Lodbrok, Ivar the boneless and Halfdan, attacked Northumbria and York. They wanted revenge for the death of their father who had been killed by Aella, the King of Northumbria. (Aella could have been an Irish Prince.) The Danes destroyed many churches and monasteries including Whitby Abbey. The monasteries remained ruined for two hundred years. |
| | Danes impose a king on Northumbria |
| | | The Danes place a puppet King on the throne in Northumbria called Egbert. |
| | Danes are attacked and move south |
| | | Armies from Northumbria attacked the Danes at York but were defeated. The Danes moved south attacking Nottingham and taking the city. The king of Mercia asked Ethelred and Alfred for assistance and an army from Wessex went to help. |
| 868 | Autumn | A peaceful settlement is reached |
| | | Ethelred and Alfred married Mercian noble women whilst assisting the King of Mercia with the Danes on his land. A peaceful settlement was reached with the Danes and a Danegeld was paid for them to leave. |
| 869 | | Danes attack East Anglia |
| | | Moving south again from York, The Danes entered East Anglia, attacking and destroying the many religious in the area including the monastery at was what to become Peterborough. The King of East Anglia, Edmund raised an army to attack the Danes but was captured and killed. |