During the Second World War, the Germans took four years to build the Atlantic Wall. On four beaches it held up the Allies for about an hour; at Omaha it held up the U.S. for less than one day. The Atlantic Wall must therefore be regarded as one of the greatest blunders in military history.
Important days don't look like anything special when they start. Invariably, the sun rises and people wake up. Coffee is swilled and eggs are swallowed. Everybody goes about the business of acting like their lives matter and then, no matter how important the events of the day end up being, the sun invariably sets. The sun rose before the soldiers stormed Omaha Beach on D-Day, and the sun set after Archduke Franz Ferdinand was killed. Sunrises and sunsets are real jerks about putting things in perspective.