I have an immortal difficulty v2.05 game where I am after Exp. Age
Ant. Age was great play. Early in the age AI Augustus was close to me, he attacked me, I had to defend, which I did.
Then Augustus allied with AI Xerxes, so I did not dare to attack either of them.
They attacked the other AI, Hatsy north of me, with no success, as that AI had 2 city states to her help.
In Exp. Age I colonized 4 treasure islands. AI Lafayette was on the other continent, he DoW-d me.
He got to one of my islands with 3 ships and 1 land unit - BUT then all units stopped 3-4 tiles away and did NOT ATTACK -
this allowed me to buy ships and units in the next 5 turns and then kill AI off from there...
So that was no good AI operation...
He attacked an other one of my treasure coastal town on a bigger island at the same time, with 3-4 land units - and almost got it!
But my ships arrived and saved the situation. Here the AI sent more troops against me, but my defense was strong to keep the toen.
Then we made peace.
My two homeland AI neighbors did not ally in this age - and did no war.
I had built up defensive military in my 4-5 border settlements, had 3-4 commanders there. Maybe this scared them off?
AIs did ZERO treasures...
At the end of Exp. Age I have 20 legacy points, best AI has 17, and then 15-15, I think...