How did feudalism rise in England

from the eleventh century, feudalism developed in England. In the sixth century, the Angles and Saxons had settled in England. The name of England is a variant of the ‘Angle-land’. In the eleventh century, Saxon king of England was defeated by the Duke of Normandy, William-I, who crossed the English Channel with an army. In this way, he conquered England. He mapped the land and then distributed it to 180 Norman nobles who came with him. These lords became the main tenants of the king.
The lords were expected to give the king military help. They also had to supply a few knights to the king. That is why lords started to gift some of their own lands to the knights. In exchange, they were expected to serve the Lord just as they, in turn, served the king. But they could not use knights for their private warfare. Anglo-Saxon peasants became tenants of different levels of landholders. In this way feudalism developed in England.