The ai just did something a little stupid. Portugal dow on me and a big stack appears near one of my cities, Stack consisted of 5 horse archers, 4 chariots,a spear, 3 axes and 6 swords. I had actually been expecting them to attack soon, so the city was very well defended. I had approx 3 cats, 5 axes ,2 swords, an archer, 4 spears and 3 horse archers. Their territory(on the corner) was 2 tiles from my borders and thats where they ended their turn (before the dow).
The next turn they move the stack adjacent to my city and now the stupid bit. All the foot soldiers are out of moves for that turn, but they attack the same turn with all the horse units. The city had 40% culture, so it was basically suicide (even though the last Horse archer took a defending axe out). Now because of the rock scissors paper system, its easy for me to take out every unit, because the horse archers (who would have beaten any of my units had they still been there) were dead. Cats first to weaken, then axes, then swords, then horse archers to mop up. They lost the entire stack, and I lost one axe. (I think the last couple were taken down by horse archers on their way from another city)
It basically ended the war there and then. Thought I'd point it out, as it was really quite dumb.Even if they hadn't been expecting such a large defensive stack, the first horse unit should /could have moved to where the stack died, seen the defense and retreated back. The stack could then have manoevered elsewhere, instead of giving me a whole GG from one stack (my first I was Byzantium-IMP bonus). Had it stayed intact, I wouldn't have dared to touch it in the field, because of the r/s/p combat system.