. ▁Sp encer ▁arrived ▁in ▁the ▁Ark ansas ▁Territ ory ▁with ▁Governor ▁Miller ▁in ▁ 1 8 2 0 . ▁Sp encer ▁had ▁entered ▁the ▁army ▁from ▁New ▁York ▁on ▁April ▁ 3 0 , ▁ 1 8 1 3 ▁as ▁a ▁second ▁lieutenant , ▁assigned ▁to ▁the ▁ 2 9 th ▁Infantry ▁Regiment . ▁He ▁had ▁been ▁a ▁captain ▁in ▁the ▁War ▁of ▁ 1 8 1 2 ▁and ▁had ▁served ▁in ▁the ▁Ni ag ara ▁campaign ▁along ▁with ▁Governor ▁Miller . ▁Sp ence ▁served ▁as ▁a ide - de - camp ▁to ▁General ▁Jacob ▁Brown ▁during ▁the ▁campaign s ▁of ▁ 1 8 1 3 ▁and ▁ 1 8 1 4 . ▁Sp encer ▁arrived ▁in ▁Ark ansas , ▁along ▁with ▁Governor ▁Miller , ▁by ▁a ▁government ▁boat ▁on ▁Christmas ▁Day , ▁ 1 8 1 9 . ▁ ▁Sp encer ▁was ▁accompanied ▁by ▁his ▁wife ▁and ▁son . ▁Upon ▁reaching ▁Ark ansas , ▁it ▁was ▁learned ▁that ▁most ▁of ▁the ▁high ▁ranking ▁posts ▁in ▁the ▁new ▁Territ ory ▁had ▁been ▁filled , ▁so ▁Governor ▁Miller ▁appointed ▁Sp encer ▁Ad j ut ant ▁General ▁of ▁the ▁Territ orial ▁Milit ia . ▁ ▁In ▁the ▁early ▁days ▁of ▁the ▁territory , ▁it ▁was ▁common ▁for ▁officials ▁to ▁hold ▁more ▁than ▁one ▁position ▁within ▁the ▁new ▁territory ▁at ▁the ▁same ▁time , ▁so ▁Ad j ut ant ▁General ▁Sp encer ▁was ▁also ▁appointed ▁as ▁the ▁sh er iff ▁of ▁Phill ips ▁County , ▁Ark ansas . ▁ ▁General ▁Sp encer ▁file d ▁the