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A comment on Tricks of Trench Warfare (2020). Parent comment

Re:Tricks of Trench Warfare (2020) by nine_k on Monday June 14, 2021 @08:47AM (#27501907)
A phone. Field phones were very much a thing during WWI and WWII, with point to point wiring laid down very soon after gaining control over the territory, or even before that.
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Re:Tricks of Trench Warfare (2020) by DyslexicAtheist on Monday June 14, 2021 @09:03AM (#27502025)
also carrier pigeons: https://en.wikipedia.org/wiki/War_pigeon
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