During feudal wars in medieval times, the serfs on a lord’s land would retreat inside the walls of the manor or fortress as the defensive forces of the city fought off invaders. The serfs are using

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the rights of independent city-states.
the rights of independent city-states.

the services of the Roman legion.
the services of the Roman legion.

a public service.
a public service.

a business service.
a business service.

a consumer service.