World War II: The <a href="https://en.wikipedia.org/wiki/Battle_of_Königsberg" id="mwsw" rel="mw:WikiLink" title="Battle of Königsberg">Battle of Königsberg</a>, in <a href="https://en.wikipedia.org/wiki/East_Prussia" id="mwtA" rel="mw:WikiLink" title="East Prussia">East Prussia</a>, ends.