Wiktionary
circumvallations
n. (plural of circumvallation English)
Usage examples of "circumvallations".
Nothing daunted, Brutus moved his troops into one of the many fortresses dotting the circumvallations built five years ago when Caesar and Pompey the Great had waged siege war there.
Though none of the earlier double circumvallations had to contend with relief armies of a quarter-million.
Land between the two sets of circumvallations, they huddled and took what was thrown at them for five days.