if you get attacked while your friends troops are there they will act as hostile troops and attack you
this is the same as getting into a alliance to rein somebody and then getting attacking them with a scout it all works against who ever has reined troops in there city
i learned this all the hard way i needed a friend to cap a ten i took from me while i was under attack and while out i got hit and the reins when rougue and attacked with enemys hit
they are no longer friendly reins as you two are not in the same alliance they will act has a hit

