colonization

As my city was under attack, I sent out a Colony Ship to found another new city. The city I sent it from was then sieged and taken over, and now I can't check the colonization progress, but I'm pretty sure it should be done by now. Does the colonization immediately fail if the city the CS was...

So I've conquered a city without a fight. My ships and soldiers are now just sitting there. I found something in the wiki that says I can't use them to support my new city ("you men, stay here & watch the boat... yes, all of you"). OK, dumb but whatever. So I'd like to re-use them to conquer...