<a href="https://en.wikipedia.org/wiki/World_War_II" id="mw8Q" rel="mw:WikiLink" title="World War II">World War II</a>: <a href="https://en.wikipedia.org/wiki/Nazi_Germany" id="mw8g" rel="mw:WikiLink" title="Nazi Germany">Nazi Germany</a> starts its strategic summer offensive against the <a href="https://en.wikipedia.org/wiki/Soviet_Union" id="mw8w" rel="mw:WikiLink" title="Soviet Union">Soviet Union</a>, codenamed <a href="https://en.wikipedia.org/wiki/Case_Blue" id="mw9A" rel="mw:WikiLink" title="Case Blue">Case Blue</a>.