How can a warrior take an enemy city?

I have a warrior standing next to a young small enemy city. How can I attack it? I do not see any options to attack.


Solution 1:

Ok this is lame. But I am new to the game and the wiki does not state the obvious.

You must declare war against in order to have the option to attack.

Solution 2:

To attack a city (or any other unit) just move the unit to the field of the unit or city. If the enemy's city is empty, a combat unit will take over control of the city. There is a wiki entry about combat digging a little deeper into the topic..