These are from the most excellent Revell horse-drawn artillery
I got these loose, along with a few other bits and pieces but never had the entire set, which I'm now on the lookout for
A lack of wheels for one of them meant I had to improvise with some spoked wheels from something a lot older; doesn't look too bad though
Each was shaded with thin black ink, then painted with Vallejo German Uniform and Highlight German Grey
I had just enough crew figures to man each piece. Might try and elevate the barrels a bit before inclusion in the scenario I'm working on.