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.
I’m reminded of Orville Tethington, inventor of the world’s first steam-powered fog machine. He’s also the guy who, after the Germans invented the flame thrower in WWI, decided to counteract it with his own creation, the candle thrower. The candle thrower was only battle tested once, and after fifteen minutes the war zone was littered with lit candles. Upon returning home after the war, some of the soldiers suffered such extreme and bizarre cases of PTSD that anytime a civilian lit a match or used their lighter, the soldiers would hit the ground and start singing “Happy Birthday.