Today i especially experimented again and was again upset.
First time i started expedition with weak army on def, and was looted weak player, sure.
I didn't change the build at this time.
After i set my strong army to def and started expedition again. And especially didt touch all the time. And what? My expedition was looted, and in the battle was offense army - weak.
Random is good idea, but here is very bad random (this definition useful and for items upgrade, but it is "other story").
Looks like random in expedition causes on every attack, and because you dont see unsuccessful attempts, attacks can be repeated while one attempt will not be resultative (with weak army or strong - if robber more powerfull).
Have somebody any idea about that?