Okay, not sure where this belongs, but as it is some kind of bug report, this cant be all wrong
Dont know if it has been reported earlier, I looked through Edi's bug list but did not find it. I am running version 3.21 + the CB mod version 1.3.
I think there is an issue with units that automatically attract other units (with the summonX command) and also have the stealthy attribute. I noted this when trying out the awesome Skavenblight nation mod by Sombre when my sneaking armies always triggered battles. Some additional testing proved that it was only while led by the Chieftain or Warlord commander that my armies attacked, despite that their move command clearly stated "Sneak", other stealthy commanders worked ok. Both these units automatically summon one unit per turn. I then deleted the summonX command from the .dm file, and then the sneak / stealth worked fine. Note that the summoned creatures in both cases have stealth +0, so the army should still be ok sneaking.
Is this only an issue with this mod or is this the case for all such units? I do not have that much experience with all nations / eras yet and do not know of another unit with these attributes.