I just got civ3c a week ago and I need some help with some of the features. 1. What does the sentry button do??? Is it like fortifying??? 2. Now this one amazed me, When you go to the civilopedia and click on a unit like a destroyer, It says anti-air defence. Can naval units really shoot down planes??? 3. What is the king unit? I went to the civilopedia and saw all these units that were king units. And it said you can only have them in short games. 4. When I installed civ 3 complete it said I have a version of conquest installed already and it recommends that I uninstall it. I didn't know what it was talking about because the only version of civilization that was on my computer was vanilla. So i continued installing and it worked perfectly. It didn't install in the same folder as vanilla civ 3. I don't think it needed vanilla civ 3. Because everyone said you need vanilla before you can install conquests. It was three CD's. It might have had vanilla on one conquest on the other and ptw on the other CD. Would this be why it didn't need vanilla??? If this was the case I would be able to install it any time without installing vanilla. 5. I installed the patch when I had civ 3 vanilla. Now that I have civ3c do I have to reinstall the patch for complete? That's all that I can think of now. I might make a new list if more question come to mind. Thank you .