The failures of WWI are more obvious than in the Civil War. In WWI, the means were readily available to circumvent trench warfare, but they were heavily resisted by the old guard. Most military leaders still thought of warfare in the sense of two armies pulling up face to face and slogging it out until one broke. They intentionally ignored and inhibited the development of technology and tactics that would have resolved the situation. The development of the tank was heavily resisted and only came to fruition after the horrendous slaughters began to have a huge impact on the home front. Even after the development of the tank, it was used rarely and improperly. Even AFTER WWI, where its usefulness had been proven decisively, most armed forces resisted the development of tank corps or the use of tanks in anything other than a support role.
Most of the major breakthroughs in WWI were done by (relatively) small units operating on local tactical level using stealth, speed and/or surprise. What is most remarkable is not that the "over the top" charges occurred at all, it is that they persisted throughout the war. Military leaders refused to accept the idea that it was a futile tactic that achieved nothing more than slaughter of both sides. This eventually evolved into an Allied strategy to simply fight trench warfare until the Germans ran out of men. That is not tactics, that is simply slaughter.
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