Nice work, Chalk. It's an interesting, solid hook, not frequently seen (in my experience), quite plausible, and well thought-out.
Just a minor nitpick but, as far as I understand, beehive rounds are direct fire only. If you want an indirect fire round that has a similarly lethal effect on enemy infantry that are not dug, proximity-fused rounds (i.e. airburst) will usually do the trick.
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