I think stuff like the Byzantine-Bulgarian wars which was about as often won by Bulgaria as the Byzantines tell quite a big issue with how CK2 military system work, it is simply too favorable for the stronger side compared to history. Often a weaker side, like Bulgaria, or England during the hundred year war was able to take Control over significant parts of a stronger realms territory and win victories even when significantly outnumbered which in turn lead to those conquests.
A larger realm could generally not mobilize its whole army against one foe because it have large borders, when Basill II invaded Bulgaria, it was only with like 30 000 and meanwhile the Byzantines was also fighting to the east but such situation seldom happen in CK2 as the ai probably don't know just how exposed a nation is.
This ability for large realms to field its whole army against one small realm at a time make it very hard for the small realms to even survive, yet alone win a war.
I think the ai should be more aggressive to realms that have lost wars and alot its army, like scavengers which I think is pretty realistic as well. This mean if you take alot of risks and lose a war really badly you may lose even more, which mean you have more reason to give up early and save your army even if you could win the war but end up with a very weak army, which would be disastrous.
A larger realm could generally not mobilize its whole army against one foe because it have large borders, when Basill II invaded Bulgaria, it was only with like 30 000 and meanwhile the Byzantines was also fighting to the east but such situation seldom happen in CK2 as the ai probably don't know just how exposed a nation is.
This ability for large realms to field its whole army against one small realm at a time make it very hard for the small realms to even survive, yet alone win a war.
I think the ai should be more aggressive to realms that have lost wars and alot its army, like scavengers which I think is pretty realistic as well. This mean if you take alot of risks and lose a war really badly you may lose even more, which mean you have more reason to give up early and save your army even if you could win the war but end up with a very weak army, which would be disastrous.
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