Feodal service, the maintenance of armed men, and the bringing them into the field, was the rent paid.
"Landholding In England" by Joseph Fisher
Mother often says we are still feodal down here.
"The Jervaise Comedy" by J. D. Beresford
II, by way of purchase (as was before observed) for the feodal tenures and other oppressive parts of the hereditary revenue.
"Commentaries on the Laws of England" by William Blackstone