What is another word for "circumvallation"?

Roget's Thesaurus (1911) lists these synonyms for "circumvallation": about, and, backwoods, balustrade, barricade, barrier, begirt, bent, beyond, bosom, bound, boundary, bourn, bury, but, case, circumscribe, circumscription, compass, confine, confinement, container, containment, conterminable, conterminate, cordon, corral, curbstone, defense, definite, demarcation, dike, dingle, ditch, door, dyke, embay, embosom, encase, enceinte.