I do the same with a hospital when in coalitions. I tell them I'll max a hospital for them all to use, and it ensures I almost always have some units there to defend.
There is of course the chance that your allies' forces in your city won't automatically attack an enemy that attacks your forces if they are not at war with them and that is a problem if the attack happens when your allies and you are offline.
![TheViper Faces A Defensive MASTERPIECE [AoE4]](http://i.ytimg.com/vi/BLUpj9_E8Xs/mqdefault.jpg)
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I do the same with a hospital when in coalitions. I tell them I'll max a hospital for them all to use, and it ensures I almost always have some units there to defend.
There is of course the chance that your allies' forces in your city won't automatically attack an enemy that attacks your forces if they are not at war with them and that is a problem if the attack happens when your allies and you are offline.