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Last ditch weapon...
https://www.msn.com/en-us/news/world/the-type-4-grenade-was-a-last-ditch-effort-by-the-japanese/ar-BB1kURiD
That was quite interesting.
The Germans made Bouncing Betty's out of mostly glass towards the end of WW2. The mines were harder to detect and wounded soldiers were harder to treat, since glass fragments are harder to find on the x-ray equipment of the time.