As for the Cossack versus a single skeleton – that's an interesting question; I just haven't had the chance to test it.

I finally got around to checking it out, and I discovered something new.
So, pay attention, everyone who didn't know or doesn't know!))
In any event, whether it's a cancellable or infinite event, the GUARDS are limited in number. The event won't be cancelled until you defeat all the guards. Once you win, you'll get all the "loot" – once, if the event is cancellable, or an infinite number of times, but without the guards – if it's not cancellable. And, of course, you can try to defeat the guards in multiple attempts; if you kill 8 out of 10 dragons and run away, the next time you'll be greeted by 2 dragons.
That's all. Personally, I don't find this arrangement very appealing. On one of my maps, I wanted to create a kind of cursed area where a constant, unchanging number of ghosts would attack players in the same location (and morale would decrease). Not only does morale decrease only after defeating the ghosts, but they don't respawn. I wanted to place some kind of "immortal garrisons" on certain "points" on this map to prevent unfairness, where one player, for example, barely manages to capture a very important tent, while another takes it for free. Now I suspect that this is impossible.