Mini-Tournament "For Sale"

I didn't think it was possible to take out a can, let alone titans. Now I understand why I had trouble with the troglodytes, which I tried to eliminate without snipers. To clear the center and the path to the castle, a griffin and an additional 6 harpies were enough to take out the ogres. But the troglodytes clearly didn't fit into the plan.
Now I won't be surprised if someone manages to find a use for the crystalline dragon. ;)