circumvallation

listen to the pronunciation of circumvallation
İngilizce - İngilizce
A rampart or other defensive entrenchment

The Saxon architect had exhausted his art in rendering the main keep defensible, and there was no other circumvallation than a rude barrier of palisades.

{n} a surrounding with walls or trenches boarded with breastwork, a trench
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
The act of surrounding with a wall or rampart