This is wonderful work , most impressive. So I hate to mention the awkward fact that on a short model trumpet like that , the tubing went around twice. If it was the length you've shown, you could only get about two or three notes out of it , making cavalry calls impossible. The tubing needed to be about seven feet long ( including the bell ) for the pitch to stand in D ; or just a little shorter , say 6 foot six, for a pitch of Eb ( a semitone higher), which was becoming fairly usual for the period and later. The old long model trumpets seem to have been phased out in the 1790s, since they were more fragile, and more awkward to carry on campaign, and the short model became standard,since it's stronger and easier to carry. It's still used by the Garde Republicaine, who have a truly excellent corps of trumpeters, playing the same calls in use in the Napoleonic period :
There are several more videos you can find if you Search
The British Lifeguard State trumpeters still carry the long model , in silver, which you can see on any State occasion .The British Army adopted the short model in Eb for field use about the same time, and it's the one still in use today.
I am a trumpeter myself and have several of these instruments.
I repeat my apology, I really don't want to make life awkward, but if the weapons were wrong everyone would notice. It's just the unfamiliarity of trumpets and their use, quite understandable in its way , that perhaps needs to be more widely known.