Final answer:
The native Britons, along with other Celtic groups, defended their homeland against the Germanic tribes of Angles, Saxons, and Jutes following the Roman withdrawal from Britain. The resulting Anglo-Saxon period was marked by the formation of various kingdoms, conflicts, and Viking raids until the Norman Conquest in 1066.
Step-by-step explanation:
The native peoples of Britain defended their homeland against various Germanic tribes, including the Angles, Saxons, and Jutes. The Angles and Saxons, migrating from what is now southern Denmark and northern Germany, settled in southern Britain in the late fifth century, after the Roman Empire withdrew its troops. This period saw the displacement of Roman culture and the beginning of the historical era dominated by Anglo-Saxons. These Germanic peoples were at first divided into various kingdoms such as Wessex, Mercia, and Northumbria, often engaging in conflict with each other, and also facing threats like the Viking raids.
In response to these invaders, the native Britons, alongside other Celtic groups such as the Cornish and the Welsh, fought to protect their lands. They experienced a major shift in their sociopolitical landscape with the fall of Rome and the subsequent influence of the Anglo-Saxons which led to the formation of an Anglo-Saxon kingdom. This period continued until the Norman Conquest in 1066 when William the Conqueror from Normandy defeated the Anglo-Saxon ruler and established Norman rule.