[Pig with Pen]

Originally Posted by ShannonA

When you play an aggression or war card, you declare the target.

Figuring out who might be a target is pretty easy: it's the player who is lagging their own military strength. This could be due to focusing on other areas, due to choosing a non-military leader like Hammurabi (who improves your Civil actions at the cost of Military actions), or due to recently spending military forces to colonize a new land.

I see, thank you. It's more about resource management than stockpiling troops along a border.