Huge flaw with taking ally cities

You can just leave a militia in cities if your worried about this, as generally I find this is used in team games to take an allies city when the ally has no chance to recap thus giving the a decent shot of still winning

Sometimes you need to use all of the militia to wall

If don't trust someone don't ally them, it is after all diplomacy and all, as scum baggy as taking an allies city is its all part of diplomacy

Your Fault for being an ally Faggot served you right! :0