I started a new game on Immortal today, Huge, Shuffle, I'm playing as Kongo. Pedro ran an unescorted Settler near one of my cities, so of course I declared and captured it. A bit later he declared on me, and after getting a few units killed, he again sued for peace. Just shy of the peace treaty expiration, he ran another Settler unescorted up next to my city, so I went to follow it, and instead of making for safety, it sort of hung around. Another war declaration, and I had myself another Settler. I've also been able to capture multiple cities with the barest of armies, France lost two cities to my 2 archers + Spearman army, since she has no walls, and Pedro lost one to 2 slingers and the spearman, while his slinger sat in his city walls never attacking. In addition, I have gotten multiple "an unmet civilization has been destroyed" messages, but it appears that may have been duplicates, or not clearing, or maybe someone liberated it and then it got destroyed again, since the victory screen only shows 1 enemy capitol controlled by anyone (and shows 11 civs out of 12). Is the AI doing a worse job of protecting its cities for anyone else?