Circumvallation
(n.) The act of surrounding with a wall or rampart.
(n.) A line of field works made around a besieged place and the besieging army, to protect the camp of the besiegers against the attack of an enemy from without.
Similar Words:
Break-circuit Circuit Circuiteer Circuiter Circuition Circuitous Circuity Circulable Circular Circularity