Judus, The Pie Eating Champion's post is correct- just make sure to sneak when talking to Inem.
As a halfling Rogue with Mask of Deception in Dark Elf form- the General and several Dragoons ago'd- I scouted around the building and didn't see them; but when trying to talk to Inem without hide or sneak, they all attacked along with the Iron Sentinels.
After escaping, I tried talking to him again with sneak and all worked fine...