[Lemmy]

I only need to do IM chat with the particular General who is involved in that particular combat.
If more than one is going to be in the same fleet, they would decide beforehand who will lead and when the other can take over.
The likely choice would be the one who is present at the time, and if both are, seniority would decide the leader unless the fleets are already divided up somehow.

What if the general isn't Online, or 2 generals are needed for 2 consecutive battles, and only one of them is Online, do you stop the game? Or let the other general take over combat?