The Maginot line was not a stupid idea - unless you also think the Great Wall of China and the Antonine Wall (built by the Romans to keep the Scots out of Britain) were dumb ideas. It's just unrealistic to assume that fortifications are the only defense needed. From Smithsonian Magazine:
>>The Maginot Line
It is known as a great military blunder, but in fact this stout network of ingenious bunkers did what it was designed to do
When World War I finally ended, France vowed never again to let Germany, the so-called "beast that sleeps on the other side of the Rhine," violate its territory. French politicians and generals conceived the Maginot Line, a network of forts and blockhouses, as an obstacle to any future invasion. Although it has become notorious as a universal metaphor for bungling, the Line in fact was not the blunder it has been made out to be. In many ways it was a model of clever engineering and technological accomplishment.
Extending about 150 miles from Sedan in the west to beyond Wissembourg in the east, the Line bristled with some 50 large fortifications, each within cannon range of another. Buried 100 feet and more under hills and ridges, the impregnable complexes were manned by up to 1,000 troops who were transported between their elaborate barracks and heavily armed combat bunkers by trolleys. They contained everything that was needed to support life underground and were virtually impervious to enemy infiltration.
Germany did invade France again, of course, but it had to go around the Maginot Line to do so. The Line itself eventually surrendered, but it was never taken by force. A number of old fortifications have now been turned into wine cellars, a mushroom farm and even a disco. A few private houses are built atop some of the blockhouses, and, yes, a number of the owners are German. <<
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