Bah! It seems to be time to stop. I’ve got methods which **should** move the ogre and his enemies reliably but…
An ogre is placed at random:

A suitable number of enemies arrive in the left-most square:

He moves – but in this case he just disappears. I guess he’s escaping the bounds of a do-while loop!
.

Then the donkeys should move – but this method appears to have gone to Cupertino.

Time to sleep!