World War II: <a href="https://en.wikipedia.org/wiki/Operation_Barbarossa" id="mwuA" rel="mw:WikiLink" title="Operation Barbarossa">Operation Barbarossa</a>: <a href="https://en.wikipedia.org/wiki/Nazi_Germany" id="mwuQ" rel="mw:WikiLink" title="Nazi Germany">German</a> troops reach the <a href="https://en.wikipedia.org/wiki/Dnieper" id="mwug" rel="mw:WikiLink" title="Dnieper">Dnieper</a> river.