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The following article is from The Great Soviet Encyclopedia (1979). It might be outdated or ideologically biased.
a line of entrenchments or ramparts around a besieged fortress. Circumvallation was used until the 19th century by the besieging forces to repulse an attack from enemy forces coming to help the besieged.
The Great Soviet Encyclopedia, 3rd Edition (1970-1979). © 2010 The Gale Group, Inc. All rights reserved.