▁up ▁by ▁Bol anus ) ▁at ▁Rey ▁Cross , ▁Cra ck ent hor pe , ▁Kirk by ▁Th ore ▁and ▁Pl um pton ▁Head . ▁Sign al - ▁or ▁watch - t ow ers ▁are ▁also ▁in ▁evidence ▁across ▁the ▁St ain more ▁area ▁- ▁Ma iden ▁Castle , ▁Bow es ▁Mo or ▁and ▁R oper ▁Castle , ▁for ▁example . ▁The ▁two ▁forces ▁then ▁moved ▁up ▁from ▁the ▁vic inity ▁of ▁Pen r ith ▁to ▁Carl is le , ▁establish ing ▁the ▁fort ▁there ▁in ▁ 7 2 / 7 3 AD . ▁ ▁Front inus ▁was ▁sent ▁into ▁Roman ▁Britain ▁in ▁ 7 4 ▁to ▁succeed ▁Cer ial is ▁as ▁governor . ▁He ▁returned ▁to ▁the ▁con quest ▁of ▁Wales ▁interrupted ▁years ▁before ▁and ▁with ▁steady ▁and ▁successful ▁progress ▁finally ▁sub du ed ▁the ▁Sil ures ▁in ▁circa ▁ 7 6 ▁and ▁other ▁host ile ▁tribes , ▁establish ing ▁a ▁new ▁base ▁at ▁Ca er le on ▁for ▁Leg io ▁II ▁August a ▁( Is ca ▁August a ) ▁in ▁ 7 5 ▁and ▁a ▁network ▁of ▁smaller ▁for ts ▁fifteen ▁to ▁twenty ▁kilometres ▁apart ▁for ▁his ▁auxili ary ▁units . ▁During ▁his ▁ten ure , ▁he ▁probably ▁established ▁the ▁fort ▁at ▁P ums aint ▁in ▁west ▁Wales , ▁largely ▁to ▁explo it ▁the ▁gold ▁depos its ▁at ▁Dol auc oth i . ▁He ▁retired ▁in ▁ 7 8 , ▁and ▁later ▁he ▁was ▁appointed ▁water ▁commission er ▁in ▁Rome . ▁ ▁Camp aign s ▁of ▁Agr icola ▁( AD  