A few excerpts from the Anglo Saxon Chronicle to give a flavour for the period of the Britannia 600 AD Campaign. I’ve used the Anglo Saxon Chronicle because of its picturesque language rather than any clarity it might bring to the time. For a more accurate and complete account see Britannia: Anglo-Saxon History.
A.D. 584 . This year Ceawlin and Cutha fought with the Britons on the spot that is called Fretherne. There Cutha was slain. And Ceawlin took many towns, as well as immense booty and wealth. He then retreated to his own people.
A.D. 591 . This year there was a great slaughter of Britons at Wanborough; Ceawlin was driven from his kingdom, and Ceolric reigned six years.
A.D. 593 . This year died Ceawlin, and Cwichelm, and Cryda; and Ethelfrith succeeded to the kingdom of the Northumbrians.
A.D. 597 . This year began Ceolwulf to reign over the West-Saxons; and he constantly fought and conquered, either with the Angles, or the Welsh, or the Picts, or the Scots.
A.D. 603 . This year Aeden, king of the Scots, fought with the Dalreathians, and with Ethelfrith, king of the Northumbrians, at Theakstone; where he lost almost all his army. Theobald also, brother of Ethelfrith, with his whole armament, was slain. None of the Scottish kings durst afterwards bring an army against this nation. Hering, the son of Hussa, led the army thither.
A.D. 607 . This year Ceolwulf fought with the South-Saxons. And Ethelfrith led his army to Chester; where he slew an innumerable host of the Welsh; and so was fulfilled the prophecy of Augustine, wherein he saith “If the Welsh will not have peace with us, they shall perish at the hands of the Saxons.” There were also slain two hundred priests, (18) who came thither to pray for the army of the Welsh. Their leader was called Brocmail, who with some fifty men escaped thence.
A.D. 614 . This year Cynegils and Cwichelm fought at Bampton, and slew two thousand and forty-six of the Welsh.
A.D. 617 . This year was Ethelfrith, king of the Northumbrians, slain by Redwald, king of the East-Angles; and Edwin, the son of Ella, having succeeded to the kingdom, subdued all Britain, except the men of Kent alone, and drove out the Ethelings, the sons of Ethelfrith, namely, Enfrid. Oswald, Oswy, Oslac, Oswood.
A.D. 626 . This year came Eamer from Cwichelm, king of the West-Saxons, with a design to assassinate King Edwin; but he killed Lilla his thane, and Forthere, and wounded the king. The same night a daughter was born to Edwin, whose name was Eanfleda. Then promised the king to Paulinus, that he would devote his daughter to God, if he would procure at the hand of God, that he might destroy his enemy, who had sent the assassin to him. He then advanced against the West-Saxons with an army, felled on the spot five kings, and slew many of their men. This year Eanfleda, the daughter of King Edwin, was baptized, on the holy eve of Pentecost. And the king within twelve months was baptized, at Easter, with all his people.
A.D. 633 . This year King Edwin was slain by Cadwalla and Penda, on Hatfield moor, on the fourteenth of October. He reigned seventeen years. His son Osfrid was also slain with him. After this Cadwalla and Penda went and ravaged all the land of the Northumbrians
A.D. 642 . This year Oswald, king of the Northumbrians, was slain by Penda, king of the Southumbrians, at Mirfield, on the fifth
A.D. 645 . This year King Kenwal was driven from his dominion by King Penda.
A.D. 655 . This year Penda was slain at Wingfield, and thirty royal personages with him, some of whom were kings. day of August; and his body was buried at Bardney … The Mercians after this became Christians.
A.D. 658 . This year Kenwal fought with the Welsh at Pen, and pursued them to the Parret. This battle was fought after his return from East-Anglia, where he was three years in exile. Penda had driven him thither and deprived him of his kingdom, because he had discarded his sister
A.D. 661 . This year, at Easter, Kenwal fought at Pontesbury; and Wulfere, the son of Penda, pursued him as far as Ashdown.
A.D. 664 . This same year there was a great plague in the island Britain.
A.D. 679 . This year Elwin was slain, by the river Trent, on the spot where Everth and Ethelred fought.
A.D. 684 . This year Everth sent an army against the Scots, under the command of his alderman, Bright, who lamentably plundered and burned the churches of God
.D. 686 . This year Ceadwall and his brother Mull spread devastation in Kent and the Isle of Wight.
A.D. 687 . This year was Mull consigned to the flames in Kent, and twelve other men with him; after which, in the same year, Ceadwall overran the kingdom of Kent.
A.D. 697 . This year the Southumbrians slew Ostritha, the queen of Ethelred, the sister of Everth.
A.D. 699 . This year the Picts slew Alderman Burt.