What were the changes in the position of the peasants during the Middle Ages and the establishment of duties?

The fall of the Western Roman Empire under the blow of the invasion of the barbarians led to a change in the socio-economic situation in the newly formed kingdoms.
The land cultivation technology was rather primitive and required a large number of workers on the farm. Therefore, peasant families preferred to have many children for more efficient farming. However, then the father of the family had to divide the land between his sons, passing it on by inheritance. As a result, such hereditary allotments turned out to be too small, the family could no longer feed itself or ensure the payment of taxes to the king. Therefore, over time, the ruined peasants fell first into the land, and then into personal dependence on the feudal lords. Dependent peasants for the use of land had to work for the lord, performing feudal duties.
In addition, the frequent wars and crop failures, from which the peasants suffered, forced them to seek protection from the feudal lords. There was enslavement, or the attachment of peasants to land plots. This is how serfdom arose.

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