Of course pretty much everyone is aware that you can gift city states units to aid them in war without declaring war yourself, but I'm a little confused. Granted, when I've gifted them units previously, I've found them using them in battle and actually managing to make good use of them in many cases, but other units I've gifted them have simply disappeared as far as I am concerned. Now do city states still undergo unit maintenance and as such "sell off" additional units they don't require? I just want to know so I can plan what and how much to gift a city state I want to use to fight a proxy war?