This is a list of wars and battles between the English or England and the Welsh from the Adventus Saxonum in c.446AD to the late Middle Ages when they ceased.
Fifth Century AD
- c.455 Battle of Aylesbury - Anglo-Saxons (Jutes) led by Hengest defeat the Britons (Welsh) led by Vortimer in Battle at Aylesbury, Kent.
- c.456 Battle of Crayford - Anglo-Saxons (Jutes) led again by Hengest defeat the Britons (Welsh) led by Vortimer in battle. The Britons are driven from (Kent) which is afterwards ruled by Hengist and his son Æsc and their descendants.
- c.465 Battle of Wippedsfleot - Britons (Welsh) defeat the Anglo-Saxons (Jutes) in battle in Kent and confine them to the island of Thanet.
- c.473 The Anglo-Saxons (Jutes) move westwards and drive the Britons once again out of Kent.
- c.486 Battle on the River Glein - Arthur of the Britons is reputed to have defeated the Anglo-Saxons.
- c.490 Second, third and fourth battles of Arthur in Linnuis thought to be modern Lindsey where he led the Britons to defeat the Anglo-Saxons at each battle.
- c.491 Siege of Anderida - Anglo-Saxons (Saxons) led by Ælle capture the Castle of Anderida from the Britons (Welsh) and slaughter the inhabitants. Ælle establishes the Kingdom of the South Saxons (Sussex).
- c.492 Battle of Bassas - Arthur defeats the Anglo-Saxons at an unidentified location.
- c.493 Battle of Guinnion - Arthur defeats the Anglo-Saxons in battle. The site was probably at Winchester which was then known as Caer Guintguic.
- c.495 Battle of Urbe Legionis - Arthur defeats the Anglo-Saxons in battle at the "City of the Legions" which is thought to probably by Chester.
- c.495 A man named Cerdic reputedly defeats the Britons (Welsh) in battle close to modern day Bournemouth and establishes kingdom of the West Saxons (Wessex).
- c.496 Battle of Mons Badonicus - The Anglo-Saxons are soundly defeated in battle by the Britons (possibly led by King Arthur) at a site generally thought to be close to Bath. This defeat establishes 50 years of relative peace.
Sixth Century AD
- c.509 Battle of Natanleod - the West Saxons led by Cerdic defeat the Britons at Netley, Hampshire.
- 519 Another battle in which Cerdic is victorious. He establishes the Kingdom of Wessex at this point.
- 527 Battle of Cerdicesleag - the West Saxons led by Cerdic and his son Cynric defeat the Britons.
- 530 The Britons (Welsh) of the Isle of Wight are conquered by the Anglo-Saxons (Jutes).
- 584 Battle of Tintern where the armies of the Kingdom of Gwent, led by Tewdrig and his son Meurig defeated the West Saxons and forced them to retreat from the Gloucester area. Tewdrig was mortally wounded and died three days after the battle.
- 590 the northern alliance of the Britons is defeated following the assassination of their leader and divisions between the former allies.
- 598 Battle of Catraeth - the northern Angles led by Æthelfrith destroy the remaining forces of the Britons of Gododdin and Bryneich (Bernicia).
Seventh Century AD
- 614 Battle of Beandun - The West Saxons led by Cynegils defeat the West Welsh, possibly led by Tewdwr ap Peredur, at Badbury Rings, Dorset. In what is likely to have been a seige over two thousand Welsh warriors died following the capture of the fort. After this battle it is likely Dorset was annexed by Wessex.
- 616 Battle of Chester - the Northern Angles of Northumbria led by Aethelfrith of Northumbria defeat an alliance of Powys and Gwynedd and capture the city of Chester amid great slaughter.
- 633 Battle of Hatfield Chase near Doncaster. Cadwallon of Gwynedd invaded Northumbria and defeats Edwin who is killed. Cadwallon occupies and ravages Northumbria, capturing York and killing many members of the Northumbrian dynasty.
- 634 Battle of Heavenfield near Hadrian's Wall where Cadwallon is defeated and killed by the Northumbrians led by Oswald of Northumbria. The Welsh are driven from Northumbria ending any pretentions at regaining the North.
- 642 Battle of Maes Cogwy]] near Oswestry where the Welsh alongside their Mercian allies were defeated by the Northumbrians.
- 658 Battle of Peonnum in Somerset where an allied force of the West Welsh and Cadwaladr of Gwynedd are defeated. The West Saxons move to conquer western Somerset including Glastonbury.
- 665 Second Battle of Badon, somewhere in the Cotswalds which was a West Saxon victory against Gwent.