This is how empires/nations die. In the end, they are either physically or psychologically unable to access a threat, and then properly deal with it. What happens to the citizens of the old empire/nation? At best they are subjugated to second class citizen status. At worse they are genocide'd. The old, the sick, males older than 12 are all killed. Males under 12 are castrated and made eunuchs to serve the new peoples. The attractive women and girls? Well, I think you know what happens there. The word: " concubine" comes to mind. All of the history, language, culture and religion of the old empire/nation are erased and replaced. All throughout history this is what has happened to conquered lands. Going down without so much as putting up a fight, some went out whimpering and some went out celebrating their own destruction.

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