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>> “The 9mm Parabellum was formed from the 7,65mm Parabellum caliber turned out to be too anemic to kill horses” <<
How many horses to you expect to encounter?
You’re full of talk and little else.
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And you don’t know your history. Look up how the 1900 Luger was tested both in Germany and the US initially to outfit the Calvary. The tests required that the then-new automatic pistols had to be able to kill a horse. The 7,65 mm failed, hence the effort to ramp it up to 9mm.
The US test pistols in 9mm still didn’t please the US Army, so DWM sent .45 caliber Lugers for further tests but by that time the Colt was looking more robust.
Read more.