World War II: The United Kingdom and France begin a <a class="mw-redirect" href="https://en.wikipedia.org/wiki/Blockade_of_Germany_(1939–45)" id="mw9Q" rel="mw:WikiLink" title="Blockade of Germany (1939–45)">naval blockade of Germany</a> that lasts until the end of the war. This also marks the beginning of the <a href="https://en.wikipedia.org/wiki/Battle_of_the_Atlantic" id="mw9g" rel="mw:WikiLink" title="Battle of the Atlantic">Battle of the Atlantic</a>.