Spoiler AI-GG unaccompanied, again... :
Then suddenly the unprotected AI-GG jumped out of the water, right in front of my horseman. Why? He could easily have stayed there for another turn...
I think, the AI could not "see" the horseman in that moment, because I couldn't see the GG either, while he was embarked. But then, why can't the AI "remember" the enemy is near? Maybe there is not enough memory to keep such information for the AI longer than absolutely necessary.
But, on the main battlefield the Harald AI is acting very well. His units rotate every turn and withdraw into FoW. And give me some good hits when I forget them...