livestock raiding + pikes: https://en.wikipedia.org/wiki/Cattle_raiding#/media/File:Sch...
(local on local domestic* feuds are well attested, both in legend and in architecture, but very little gets built these days with defensibility as a prime consideration)
I'll have to reread, but (having just arisen this morning) even caucasians were known for their feuds: https://en.wikipedia.org/wiki/Vainakh_tower_architecture
As a prediction before checking the etymology, I'll bet Муха/Mücke goes back all the way to PIE: one of the benefits of sitting around the campfire (attested!) for getting high (attested!) and gossiping about body counts (attested!) is that it tends to discourage insects (is this attested?)
RCH as a measurement unit seems to have been derived from a more humanistic tradition, however.
* international mixups ( https://www.youtube.com/watch?v=eePHXDl0Pjc ) mostly ended when the poverty did, although I note that just this summer I saw a job posting for international development work that required either small arms certification or the equivalent army service. A colleague in KFOR tried to convince me, around the turn of the century, that vacationing where he'd served was great; I was almost ready to believe him until he started listing the "simple" rules for avoiding likely minefields.