Take a look at the save game - you'll find a krax army with catapult up north.

Take my main amrmy and have a battle with it

Its a pretty obvious priority targget unless youy enjoy picking rocks out of your hair.

Sooo have one of the trusty flak units target it.

Surprise surprise - they'll gallup up to it, run their hands in awe over its smooyh mahogoney finish, and then gallup back to their lines.

They then pass word to their buddies that it's really indstructible, SO NOBODY can even target the d*mn thing.

So, after you whack every one else, unless you enjoy rocks hit the auto-end and that dispatches it.

Second time this has happened, the animation is pretty funny.

save game here https://dl.dropbox.com/u/109779367/The%20amazing%20Catapult%20aka%20Tank.EleSav

Enjoy!