▁in ▁that ▁year ), ▁not ▁returning ▁south ▁until ▁ 8 1 , ▁at ▁which ▁time ▁he ▁cons olid ated ▁his ▁g ains ▁in ▁the ▁new ▁lands ▁that ▁he ▁had ▁conquer ed , ▁and ▁in ▁the ▁reb elli ous ▁lands ▁that ▁he ▁had ▁re - con quer ed . ▁In ▁ 8 2 ▁he ▁sa iled ▁to ▁either ▁K int y re ▁or ▁the ▁sh ores ▁of ▁Ar gy ll , ▁or ▁to ▁both . ▁In ▁ 8 3 ▁and ▁ 8 4 ▁he ▁moved ▁north ▁along ▁Scotland ' s ▁eastern ▁and ▁northern ▁coast s ▁using ▁both ▁land ▁and ▁naval ▁forces , ▁campaign ing ▁successfully ▁against ▁the ▁inhabitants , ▁and ▁winning ▁a ▁significant ▁victory ▁over ▁the ▁northern ▁British ▁pe op les ▁led ▁by ▁Cal g ac us ▁at ▁the ▁Battle ▁of ▁M ons ▁Gra up ius . ▁Arch ae ology ▁has ▁shown ▁the ▁Rom ans ▁built ▁military ▁cam ps ▁in ▁the ▁north ▁along ▁G ask ▁R idge , ▁cont rolling ▁the ▁gl ens ▁that ▁provided ▁access ▁to ▁and ▁from ▁the ▁Scottish ▁High lands , ▁and ▁also ▁throughout ▁the ▁Scottish ▁Low lands ▁in ▁n ort he astern ▁Scotland . ▁ ▁Prior ▁to ▁his ▁recall ▁in ▁ 8 4 , ▁Agr icola ▁built ▁a ▁network ▁of ▁military ▁roads ▁and ▁for ts ▁to ▁secure ▁the ▁Roman ▁occupation . ▁Ex isting ▁for ts ▁were ▁strength ened ▁and ▁new ▁ones ▁plant ed ▁in ▁n ort he astern ▁Scotland ▁along ▁the ▁High land ▁Line , ▁cons olid ating ▁control ▁of ▁the ▁gl ens ▁that ▁provided ▁access ▁to ▁and ▁from ▁the