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Static fortifications became significantly less important after gunpowder and especially so after the end of WW1. However they still obviously had strategic uses.

What's the most important place and time that a particular line of fortifications could possibly be in the 20th century? How long could an individual line of fortifications be held during a single war? This could occur during any conflict in the 20th century.

If the Munich Agreement hadn't happened and WW2 started in 1938, would the Czechoslovak border fortifications have been considered this?
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