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seakingsoyuz t1_j5la4r5 wrote

Reply to comment by Quelchie in TIL the first known résumé was written by Leonardo da Vinci, when applying to be a military engineer for the Duke of Milan. It's mainly just a list of his designs for siege weapons (including trebuchets). He briefly mentions his art: "In painting, I can do everything possible." He got the job. by Pfeffer_Prinz

This is total speculation, but anyway:

Underground warfare made a brief resurgence in WW1, because the front lines in Flanders were on top of soft chalk and the trench lines meant that the Western Front devolved into siege warfare. Counter-mining was also a serious concern, so the troops digging the tunnels would sometimes drill holes, soak the rock with vinegar to soften it further, then scrape away the top layer and repeat. This was a lot quieter than just hacking away with a pick.

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