Due to change in AI's tactics?
Feels weird when bot has the last city, some military and yet tries to retreat into oblivion. It might be realistic, tho, but doesnt add to enhanced gaming experience.
Like I deployed 7-8 ranged and 1-2 melee naval units in one doomstack. Came to AI's border, I had huge vision so I saw his moves. What bot did - brought 3-4 units, they firstly came closer to my doomstack, then got scared and tried to escape - for 1-2 tiles, which I believe how many AP left from previous move. (Yes I clearly saw back-forth moves) Without any tries to harras me, even with melee vs my ranged. Eventually I destroyed his small group without any hp loss. I can't say that's because I super pro strategist, meh.