▁Den mark ▁against ▁the ▁Kingdom ▁of ▁Pr uss ia ▁in ▁the ▁First ▁War ▁of ▁Schles wig ▁by ▁placing ▁Swedish ▁and ▁Norwegian ▁troops ▁in ▁canton ments ▁in ▁Fun en ▁and ▁North ▁Schles wig ▁( 1 8 4 9 – 1 8 5 0 ), ▁and ▁was ▁the ▁medi ator ▁of ▁the ▁Tru ce ▁of ▁Mal m ö ▁( 2 6 ▁August ▁ 1 8 4 8 ). ▁He ▁was ▁also ▁one ▁of ▁the ▁gu ar ant ors ▁of ▁the ▁integrity ▁of ▁Den mark ▁( the ▁London ▁Pro tocol , ▁ 8 ▁May ▁ 1 8 5 2 ). ▁ ▁As ▁early ▁as ▁ 1 8 5 0 , ▁Oscar ▁I ▁had ▁conce ived ▁the ▁plan ▁of ▁a ▁d yn astic ▁union ▁of ▁the ▁three ▁Sc and in av ian ▁kingdom s , ▁but ▁such ▁difficulties ▁presented ▁themselves ▁that ▁the ▁scheme ▁had ▁to ▁be ▁abandoned . ▁He ▁succeeded , ▁however , ▁in ▁revers ing ▁his ▁father ' s ▁ob sequ ious ▁policy ▁towards ▁Imperial ▁Russia . ▁His ▁fear ▁l est ▁Russia ▁should ▁demand ▁a ▁stretch ▁of ▁coast ▁along ▁the ▁Var anger ▁F j ord ▁induced ▁him ▁to ▁remain ▁neutral ▁during ▁the ▁Crime an ▁War , ▁and , ▁subsequently , ▁to ▁conclude ▁an ▁al liance ▁with ▁Great ▁Britain ▁and ▁the ▁Second ▁French ▁Empire ▁( 2 5 ▁November ▁ 1 8 5 5 ) ▁for ▁pres erving ▁the ▁territorial ▁integrity ▁of ▁Sweden - N or way . ▁ ▁Death ▁In ▁the ▁ 1 8 5 0 s , ▁Oscar ' s ▁health ▁began ▁to ▁rapidly ▁d eter