OOC:
I'm still getting a feel for the magic system, so I'm going to rule that for this encounter, these summoned creatures can indeed be Ironbound. With that in mind, they do need to make the Fright Check when they move forward, which will be this turn. (This adds a bit of strategy to things you summon going forward: If you're facing the full-sized dragon, say, your summoned creature's Discipline becomes just as important as its Brawn!)
Here's why I'm not worried about this being overpowered: First, you have to maintain two concentrate maneuvers each turn to keep the Ironbound in play and to give them orders. That means you can't even walk as long as these guys are in play.
Second, even one threat rolled against HIldar could result in "the active character loses the benefits of a prior maneuver" from the threat/despair chart. That could mean that the creatures don't do what they're told or even disappear. Seems kind of lame for 1 threat, but it's RAW. I'll probably reserve such a thing for more threat or a despair (if I do it at all), but that's always a possibility.
Third, we haven't established whether these are real Ironbound, or just facsimiles. If they're real, it's possible that Hildar has really pissed off someone in Nerekhall, which could have repercussions down the road. I'll leave it ambiguous what their provenance is for now... :P
The point is, summoned Ironbound are pretty powerful. But on the other hand, they severely handicap Hildar for as long as they are on the battlefield. I'm cool with that. Let's see how things shake out.