Ogre Wars event bugged
I’ve had problems with this one two, so long as you only start the south event it should eventually trigger, though I’ve had to do the 1st champion twice to get it to trigger, sometimes 3 times. you just need patience with this one, it’s a bit like the Hydra Queen event, you have to kill the champ boss like 3 times before they swim off and start the next in the event chain.
One possible factor which can block the event from proceeding after the first two Champions are killed is whether or not the Charr leader (I forget her name, but she’s dressed in Blood Legion armor) is alive. Run back to the N gate of Foulbear Kraal and see if she’s lying dead there on the ground. If she is, revive her. This will sometimes kick off the next event to destroy the ogre houses/pet houses.