The way to manually attack troops is to click on your army then click on the army you want to kill.
If you want to rob a storehouse, click on your army then click on the store house and click the storehouse.
To move to any square, even the exit, click your army then click the exit. Then click "Order armies to leave the city."
However, if you send a campaign option, this may interfere with your controls in the city.
Try sending without a campaign active and see if manual control is restored.
I believe that the "attack" campaign only attacks, if there is an automatic rob, then try that.