acy , ▁a ▁coal ition ▁of ▁Brit ton ic ▁P ict ish ▁tribes ▁of ▁the ▁north ▁of ▁Britain . ▁ ▁He ▁used ▁the ▁three ▁leg ions ▁of ▁the ▁British ▁g arrison ▁( aug ment ed ▁by ▁the ▁recently ▁formed ▁ 2 nd ▁Par th ica ▁leg ion ), ▁ 9 0 0 0 ▁imperial ▁gu ards ▁with ▁caval ry ▁support , ▁and ▁numerous ▁auxili aries ▁supplied ▁from ▁the ▁sea ▁by ▁the ▁British ▁fleet , ▁the ▁Rh ine ▁fleet ▁and ▁two ▁fle ets ▁transferred ▁from ▁the ▁Dan ube ▁for ▁the ▁purpose . ▁According ▁to ▁D io ▁Cass ius , ▁he ▁inf lic ted ▁gen oc idal ▁dep red ations ▁on ▁the ▁n atives ▁and ▁in cur red ▁the ▁loss ▁of ▁ 5 0 , 0 0 0 ▁of ▁his ▁own ▁men ▁to ▁the ▁attr ition ▁of ▁gu err illa ▁tact ics ▁before ▁having ▁to ▁withdraw ▁to ▁Had rian ' s ▁Wall . ▁He ▁rep a ired ▁and ▁rein for ced ▁the ▁wall ▁with ▁a ▁degree ▁of ▁thorough ness ▁that ▁led ▁most ▁subsequent ▁Roman ▁authors ▁to ▁attribute ▁the ▁construction ▁of ▁the ▁wall ▁to ▁him . ▁It ▁was ▁during ▁the ▁negoti ations ▁to ▁purchase ▁the ▁tr uce ▁necessary ▁to ▁secure ▁the ▁Roman ▁retre at ▁to ▁the ▁wall ▁that ▁the ▁first ▁recorded ▁utter ance , ▁att rib utable ▁with ▁any ▁reasonable ▁degree ▁of ▁confidence , ▁to ▁a ▁native ▁of ▁Scotland ▁was ▁made ▁( as ▁recorded ▁by ▁D io ▁Cass ius ). ▁When ▁Sept im ius ▁Sever us ' s ▁wife , ▁Julia ▁Dom na , ▁critic ised