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of the compass.The construction crews dug a trench (fossa), throwing the excavated material inward, to be formed into the rampart (agger). On top of this a palisade of stakes (sudes or valli) was erected. The soldiers had to carry these stakes on the march. Over the course of time, the palisade might be replaced by a brick or stone wall, and the ditch served also as a moat. A legion-sized camp placed towers at intervals along the wall with positions between for the division

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