The Russian Army crosses the Prut river into the <a href="https://en.wikipedia.org/wiki/Danubian_Principalities" id="mwtA" rel="mw:WikiLink" title="Danubian Principalities">Danubian Principalities</a> (<a href="https://en.wikipedia.org/wiki/Moldavia" id="mwtQ" rel="mw:WikiLink" title="Moldavia">Moldavia</a> and <a href="https://en.wikipedia.org/wiki/Wallachia" id="mwtg" rel="mw:WikiLink" title="Wallachia">Wallachia</a>), providing the spark that will <a href="https://en.wikipedia.org/wiki/Crimean_War#First_hostilities" id="mwtw" rel="mw:WikiLink" title="Crimean War">set off the Crimean War</a>.