You could make a cannon out of a normal unit and
change the graphic and stats to a cannon.
It's not the perfect answere but it could be made
functional.
For example if you were willing to use a little or a lot
of imagination, depending on your point of view,
you could have a six man unit each man being a cannon.
With the man being represented in the bif as a couple of guys and a cannon.When you want it to move, it turns into a horse and moves.If we could get this to function somewhat
then we could simulate horse artillery batteries
after a fashion.Does this interest you or do you think
it's a load of crap?

We have tried it a bit.
We had a 16 cannon unit.Every time it fired 16
cannonballs.It took about 3 minuets to destroy
a line of 3 units.A cheap fun way to get lots of fire power
in one unit at least

LK