I fee like a noob, I must be missing something. I had three armies surrounding an enemy city. When I selected one of the armies and moved the mouse over the city, the cursor turned to two crossed swords, but clicking the mouse did nothing. I wanted to declare war and attack. So I tried to engage in conversation with the sov I wanted to declare war on. He just says "I'm too busy right now...". So, how do I attack?
In the end I had to wait 3 turns and finally he told me to get off his land, at which point I could declare war. Is this the way to do it?