here in South Africa they were mounted on the front wheels of an ox wagon like this particular one. The voortrekkers were masters of improvising, thanks to a serious shortage of supplies in the untamed interior.
They prefered a round called a "beesvelbom" tr: cow hide bomb. This was a cylinder fasioned from leather, roughly sewn. The diameter of this cylinder was roughly the bore diameter of the intended cannon. they would then sew in a panel at the bottom, leaving the top open. The cylinder was then filled with any type of shrapnel they could get their hands on.Typically, pieces of broken iron pots, musket balls, nails, broken porcelain etc. Animal fat was then melted and poured into the container to fill the gaps between the sharpnel pieces. and left to set.
These were then fired at short range directly into the ground in front of the charging natives when in battle. The result was basically a early 19th century claymore.