This term refers to a defensive structure used by the Romans, consisting of a wall that was 9 feet high and a ditch that was 15 feet wide. It served as a barrier to protect Roman military camps or settlements.
Agger: A mound of earth used to build up fortifications or raise the height of walls.
Murus: Refers to the actual wall structure itself, often made of stone or brick.
Vallum: A defensive ditch or trench dug alongside the wall for additional protection.
AP Latin - 7.2 Caesar, Gallic War, Book 5, Chapters 41-43
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