Nor is it clear how much further we have to go, although that is not surprising. Long wars have no signs telling us how many miles remain to the destination. The armies of Central Europe did not know in 1633 that they were halfway through the Thirty Years War. We will not know how close to (or far from) the end we. ."
https://www.ctc.usma.edu/posts/fifteen-years-on-where-are-we-in-the-war-on-terror
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