The only problem I had with them is that the guy meant to be ramming a rod down the barrel isn't tall enough to do so. If he is mounted with the bottom of his base at the same level as the bottom of cannon, the ramrod isn't nearly high enough off the ground to be at the mouth of the barrel. It seems very strange to me that it would be designed this way. I corrected it by building up the base under that figure with some flat tooth picks. So it looks like both of those figures are standing on conveniently located bumps in the ground.
There are also a couple of figures (the guy I have pushing the wheel, and the guy just resting his hand on the cannon barrel) that I'm not sure what they are meant to be doing. I just made my best guess at where to put them, but I'm not sure if that is what they are intended to be doing. Anyway, here are some pictures of my completed battery.