It would have normally been 6 except we were in anarchy that one turn so need stacks of 5 making 10. So just bad luck all around.
Interesting! An AI attack against a human army.We lose one of our Charron Armies
In addition to attacks in the city, the AI will attack if the hit points are low enough. Red lined Armies definitely need to be defended. In addition, I have had healthy armies killed when the attack value is high compared to the defense, so low defense armies are not safe late enough in the game. There may also be a component where they can get attacked if it is the only thing the AI can reach. I forget the details but this can effect initial landing on a separate landmass.I've seen that in base C3C. The AI will avoid attacking armies in the field, but they'll attack with everything they have to take a city. Bad luck that Spain declared when they did.
I doubt that we will even come close to having more than 1 Army per 4 towns. Though we might come close if we were going for a conquest victory.At present each city in CCM3 can hold an army. May be I should set this to the standard 4 cities for an army in the next version of the CCM 3 biq.