Cannon salute to the Fourth of July! Savannah dredging operations brought up Civil War and Revolutionary War artifacts. How did the projects and weapons compare?

CSS Georgia Dahlgren pulled up from river in 2015; one of the Revolutionary War cannons in 2021 and this week's unveiling of conserved artillery pieces at the Savannah History Museum (U.S. Army Corps of Engineers photos)

A stunning collection of Revolutionary War cannon recovered off Old Fort Jackson in Savannah, Ga., is now on public display, the culmination of an extensive archaeological and conservation effort.

A contractor dredging the Savannah River in 2021 came across the first of the 19 artillery pieces, which some thought might belong to CSS Georgia, a Confederate ironclad that was scuttled nearby by its crew in December 1864.

But it soon became apparent they dated to the American Revolution and the British siege of the city in 1779. They were on ships scuttled by the British to prevent French support of the colonists.

The surprise discovery of the Revolutionary War weapons came following the 2015-2017 recovery of items associated with the Civil War ironclad. That U.S. Army Corps of Engineers harbor deepening project, which involved contractors and U.S. Navy divers, recovered more than 30,000 CSS Georgia artifacts, including 241 pieces of ordnance, five cannons and two large casemate sections. The latter were documented and left in the water.

A section of the CSS Georgia's casemate in 2017 (U.S. Army Corps of Engineers)

The Corps of Engineers worked with Texas A&M University to conserve the CSS Georgia material and then 17 of the cannons associated with the Revolutionary War. The Savannah History Museum this week opened “Loyalists and Liberty: Savannah in the American Revolution.”

Chris Dostal, director of the conservation lab at Texas A&M, told the Civil War Picket:

“From a conservation standpoint, both projects involved large, concreted iron artillery from a marine or riverine environment, but the Savannah River cannon presented a particularly unusual opportunity because so many guns were recovered together, several with associated bore contents preserved.”

Some CSS Georgia artifacts are on display at the National Civil War Naval Museum in Columbus, Ga. (At left, one of its propellers, Picket photo)

The Picket recently asked officials to provide some context to how both archaeological projects dovetailed or differed.

The following responses came from Francis “Franky” Stankiewicz with Chronical Heritage, Andrea Farmer, archaeologist with the Savannah district of the Army Corps, and Cheri Pritchard, media relations chief with that office. The responses have been edited for brevity and context.

Q1: Are you any closer to knowing precisely which British ships these Revolutionary War cannon belonged to? I know the HMS Rose was ruled out.

A: We have learned a great deal since the cannon were conserved, but I would not say we can assign individual guns to specific vessels with certainty. The strongest current interpretation is that the assemblage most likely originated from the armed ship Savannah, formerly the American privateer General Arnold, and the British transport Venus, both of which were associated with the 1779 Siege of Savannah. Current research suggests that domestic colonial production is the most likely origin for the guns attributed to the General Arnold/Savannah. However, manufacture in Britain, France (particularly Bordeaux), or Spain (particularly Bilbao) cannot be ruled out. Within the realm of domestic production, Rhode Island and Pennsylvania presently appear to be the most probable manufacturing centers.

Andrea Farmer with two reenactors at the Savannah History Museum (USACE photos)

Q: There was early speculation these 19 cannons might date to the Revolutionary War era but might have been placed on the CSS Georgia or fortifications. What led you to determine they dated to the Revolution?

A: The Revolutionary War interpretation rests on several lines of evidence. Typologically, the guns are mid-to-late 18th-century 6-pounders, including examples exhibiting Armstrong-pattern characteristics as well as related short-gun variants. Historically, British and French accounts document the burning and scuttling of armed vessels in this section of the Savannah River during the 1779 Siege of Savannah, consistent with the location of the recovery area. Archaeologically, many of the cannon were recovered in a loaded condition, containing tampions, wadding, shot, powder cartridges, fuse remains, and powder residue, indicating that they were likely prepared for immediate use rather than discarded at a later date. Taken together, the age, location, and loaded condition of the guns strongly support their association with the Revolutionary War-era scuttling events in the Savannah River.

Q: From an archaeological and conservation viewpoint, how different are these cannons vs. those found at CSS Georgia site?

A: From a conservation standpoint, these cannons were unusually rich in sealed contexts. Most were heavily concreted and contaminated cast iron, but many still held preserved bore contents. That meant conservation was also excavation: tampions, hemp junk wads, shot, cartridges, and residues had to be removed and documented in sequence. CSS Georgia material, by contrast, is Civil War ironclad wreckage and ordnance context: later, more industrial, and tied to an armored floating battery. The Savannah cannon assemblage is earlier, Revolutionary War-era muzzle-loading artillery, and its research value comes heavily from the combination of gun form, loading evidence (i.e., material within), and scuttling context. (See link for more photos)

Q. I know the investigation into CSS Georgia concluded a few years back. Have you learned anything more about the site or vessel since then?

A: The CSS Georgia investigation itself concluded earlier, and the current investigations do not indicate a major new interpretation of the vessel since that work. What they do add is a broader landscape context: the cannon cluster site lies near, but is not part of, the CSS Georgia site, and prior mapping work around CSS Georgia actually helped identify the Revolutionary War cannon concentration.

Q: Do you have a schematic/map or illustration showing their precise location in the Savannah River? And do you have anything similar showing the CSS Georgia cannon location -- or both put together?

A: To help preserve and protect these cultural resources long-term, we are not publicly disclosing their precise locations. While the locations are known to a limited number of researchers and resource managers, there is broad agreement that this information should remain restricted for now. Limiting access helps protect the sites from disturbance while supporting future research and analysis that may provide additional insights. Researchers continue to use a variety of mapping products, including sonar and multi-beam imagery of the Cannon Cluster Site near Fort Jackson. Specific details about the exact locations of these resources and their relationship to one another are also being withheld to support ongoing stewardship and future study. In addition, the Savannah Harbor shipping channel is heavily trafficked by large commercial vessels. Restricting site locations helps discourage unauthorized diving activity and reduces potential safety risks. (At left, anchor from one of the 18th century vessels, USACE)

Q: Finally, what is your long-term perspective on both CSS Georgia and these 19 cannons -- What do they tell us about their chapters in American history?

A: Although separated by nearly a century, CSS Georgia and the Revolutionary War cannon cluster represent two distinct chapters in Savannah's long history as a strategically important river port. CSS Georgia represents the Civil War effort to hold the river with improvised Confederate naval technology, including an ironclad that functioned more as a floating battery than an effective maneuvering warship. The cannon cluster reaches back to the Revolution when British forces deliberately used vessels and their armament to obstruct the river and help stop the French fleet during the Siege of Savannah. Together, they show that control of the Savannah River was repeatedly central to military strategy, commerce and the fate of the city.