The model below is the first Skaven Screaming Bell, issued by GW in 1993 or 1994. I always tought it funny that the Bell could move by itself, so I decided to use 2 Rat Ogres to pull the Bell. A Clan Moulder Packmaster and some giant rats makes up the full model.
I am not sure what the current GW logic is moving the Screaming Bell. Some weird magical explanation involving warpstone probably …
Anyway, my Screaming Bell never really saw action on the gaming table. I completed it after I was done with Warhammer, and since then, I never again played the large-scale fantasy games we used to have. I am still looking for the optimal fantasy mass battle ruleset though!