▁tim ber ▁r amp art ▁which ▁was ▁re built ▁in ▁study ▁around ▁AD   1 9 0 . ▁▁ ▁The ▁visible ▁outline ▁of ▁the ▁def ences ▁of ▁the ▁fort ▁contains ▁an ▁areas ▁of ▁ 1 . 1 6 ▁H ect ares ▁( 2 . 8 ▁acres ). ▁The ▁fort ▁platform ▁surv ives ▁to ▁a ▁height ▁of ▁ 3 . 9   m ▁and ▁it ▁is ▁surrounded ▁by ▁a ▁single ▁d itch ▁on ▁the ▁north , ▁east ▁and ▁south ▁sides , ▁with ▁a ▁series ▁of ▁five ▁d itch es ▁on ▁the ▁west . ▁An ▁an nex e ▁to ▁the ▁fort ▁measures ▁ 9 9   m ▁x ▁ 7 3   m . ▁ ▁The ▁site ▁was ▁abandoned ▁between ▁ 1 2 0 ▁and ▁ 1 6 0 . ▁The ▁fort ▁interior ▁was ▁re built ▁in ▁the ▁early ▁third ▁century ▁by ▁the ▁C oh ors ▁VI ▁N er vi orum . ▁Reb u ild ing ▁across ▁the ▁whole ▁site ▁took ▁place ▁in ▁the ▁late ▁fourth ▁century , ▁with ▁pot tery ▁evidence ▁suggesting ▁a ▁late ▁abandon ment . ▁ ▁Disc overy ▁and ▁exc av ation ▁In ▁William ▁Cam den ' s ▁ 1 5 8 6 ▁Britann ia ▁the ▁fort ▁is ▁referred ▁to ▁under ▁the ▁name ▁B rac ch ium ▁and ▁this ▁name ▁pers isted ▁in ▁early ▁ed itions ▁of ▁the ▁Or dn ance ▁Survey ▁maps . ▁The ▁fort ▁was ▁first ▁exc av ated ▁by ▁John ▁Kirk ▁and ▁R . ▁G . ▁Col ling wood ▁in ▁ 1 9 2 5 - 6 , ▁then