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Do you declare war for a specific territory? But then, what prevents you from winning ALL the territory piece by piece?;) Gradually... of course, it will take a lot of time, but if you really want to, you can, right?
And while you send all your armies to attack, someone else will capture your land (so you can't send your entire army to attack). Besides, defenders are protected by city garrisons and walls. So it's easier to hold out than to lose. By the way, you can also allow the creation of alliances.
УШЁЛ НАВСЕГДА ОТ ВАС КРИТИНОВ....ГЕРОИ ГОВНО ВЛАСТЕЛИН КОЛЕЦ ФОРЕВА