So I've been besieged twice by my neighbors now, and each time I decided to go out and break the siege. But as soon as I go to the army screen and tell my troops to move out, the army only then attacks my city. So I immediately recall my troops to defend against the attacker.

This doesn't feel like how it's supposed to work, so I think I'm either missing a shortcut to just attacking the besiegers with fewer clicks or they shouldn't see my city as likely "undefended" once my troops are mustered to leave. Let me know what you think!