in my game, the minor nation Hurshen has become a Patagon colony and I wonder what will happen if I conquer the capital of Patagon?

Since he will fall into anarchy, what will happen to his colony?

My plan is that if Hurshen becomes a small country again (is that really possible?) I will offer him bribes.

Thank you for your answer.

Yes indeed the small country loses its colony status and the next turn, its territories change color according to the former owner (in my case purple for the Patagon).

As a result, as its same territories sank into anarchy, my plan failed and all the other great powers began to grab them avidly.

For your question about the armies of great power in a colony, it is difficult to give you a precise answer, I will tell you what happened to me during my tests.

One GP had placed a good number of artillery in in the Capital of his colony, but when I declared war on it the next turn it had fully moved its troops back to its home capital (Patagon City).

So I have the impression that he takes his troops out of the colony every time his home country is threatened, after which I haven't done any further testing.

I finally found the answer to your question, in my game Ordune is in anarchy, but he still had some provinces left that I had not conquered, and in one of them I fought with surprise 10 heavy artillery pieces that Ordune still had.

So I think that even if the enemy capital is conquered, its armies that are stationed in the colonies simply get "stuck" and do not disappear.

Thanks for the answer
Ordune's Capitol must have fallen so quickly that the the troops couldn't get back to the Capitol which is usually the end move for the AI.