I've used my "prime mover" of choice the Foundry Mutiny gun elephant. I wish I had bought two of them, but may get a chance at a similar piece once the fellow at "Odds and Ends Miniatures" sends his greens off to the casters.
Here are some photos of the gun and its crew.
The crew are from Old Glory's line of 28mm Sikh War figures. This is one of their well done lines, the sculpting is consistent and done well. I hope to post some images of their Sikh Irregular infantry, when I'm done basing them.