Looks like army moving are very bugged, i see in the errorlog.txt messages like these :
camp order missing parent -- army will camp forever
And if you move into a bandit or army * in the world map (without being the one ambushed) , chances are that everyone is sleeping and will never wake up.
Very buggy unfortunately.
I found a goblin site in which lag was still playable, the tower was empty and in the bottom of that tower there was a stair down to their pits.
I explored a bit an ran into the place they hold their trolls.
I guess sneaking in will be hard, but it's not like the trolls are really hostile, they even have jobs and i even spotted some goblins that are shooting bolts at their trolls and the trolls do not try to kill them in retaliation.
I hope Toady will move a bit more toward those broken relationships/reactions between NPC in the upcoming releases.
edit : oh yeah, it's very bad
a bit over thirty trolls were killed, all of them in the view of nearly everyone, and not a single time any troll decided to attack me, only the trolls i hit first will react, assuming my first strike didn't put them unconscious.
Funny but i observed a Troll Hunter (nearly all of them have jobs) and went into a crossbow shooting contest with a goblin that had a crossbow too.
The Troll Hunter was luckier and killed the goblin, still didn't went hostile to me with all the trolls corpses i left around