@Felix
The history and background were interesting to read, though I think you can still make it sound more like a textbook. But it's also possible that it's not a textbook, since the contents are only referred to as "trivia". A book title would make things clearer, eg "Historical Perspectives from the Great War" vs "100 Facts from the Past".
Regarding the barriers and the Velocity-Altering technology, I think it's good that you mentioned some obvious ways to subvert the fields and how these methods were unsuccessful, hence warfare regressed to primitive methods. It helps a lot to make the setting believable since the nagging doubts are preempted. Though personally, I don't quite think people will regress to swords and steel; from my own point of view tanks are still viable weapons; no amount of spearmen can possibly destroy a tank! No firepower is okay, we'll just use them as land ironclads, run over any resistance, and if there's another tank we'll duke out with ramming speed.
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