I found the pictured entry in a ledger book within National Archives Washington DC Record Group 92 Entry 2117. It shows the US purchased, apparently at New Orleans, a significant quantity of wnat appears to be standard French artillery of the period.
I just found this and have no idea of the actual purpose of this buy. Was it just for convenience since these pieces happened to be available there and then, or was it for some kind of trial and experiment?
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