No these aren't Revere Napoleons, they are British 3-pounders, but I think the story is kind of interesting anyway. There are dozens of photos of the guns, steel carriage, and scans of documents. I'm posting this here because as I recall Mark is interested in 3-pounders and didn't want him to miss this.

Brief article and slideshow of 1859 gun on steel carriage:
http://gs19.inmotionhosting.com/~milita ... /read/9322

Documents; rubbings of 1808 gun:
http://gs19.inmotionhosting.com/~milita ... /read/9323

Photos of 1808 gun:
http://gs19.inmotionhosting.com/~milita ... /read/9324