“Light 12-pounders to be used as mortars”: A Spotsylvania ‘what if?’ from the artillery persepctive

I’m a bit behind on “coverage” of artillery subject on my planned sesquicentennial-themed time line.  So I hope you readers will indulge as I back-track here (and a few more times over the next few weeks), chronologically speaking.  The letter below properly fit into a post for the first week of May when I referred