DmitriyAS
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Personally, I disagree with the following point:
1.4.10. It is forbidden to weaken unupgraded neutral armies through multiple defeats.
Although I don't particularly mind it :)
It's just that in such battles, a very specific battle walkthrough tactic is artificially prohibited. That is, you can use this tactic against mixed armies but not against unmixed ones.
You're a bit confused...
In the first case, you really do have to kill the entire group of neutrals, even if by repeatedly attacking the last ones. That is, you methodically kill all groups.
In the second, only the unupgraded neutral units are killed, you retreat, and the entire neutral group disappears from sight. Thus, in this case, the upgraded stacks are obtained "for free," and that is not good.
And the tactics turn out to be completely different, not the same as you claim.