Haha thats funny.
You probably just summoned an archer, and since its commanable, that archer that you summoned is idle, and no ogres spawn. Thats really funny.
You might want to know about this cheat
Noted this down on my list.
The intent of the level was to have archer stay close to reindeer, so ogres don’t spawn, hence the ogres not spawning was an intended feature.