Die etenim statuto mane surgentes monachi sumpserunt Scutum rotundum, cui imponebant manipulum frumenti, et super manipulum cereum circumspectae quantitatis et grossitudinis.
"Beowulf An Introduction to the Study of the Poem with a Discussion of the Stories of Offa and Finn"
R. W. Chambers
Chapter 12 is the one relating to scutage, from the word Scutum, shield-meaning the service of armed men.
"Popular Law-making"
Frederic Jesup Stimson