A dozen more Revolutionary War cannons were uncovered last month in the Savannah River outside Savannah, Georgia, according to a video and photos posted by the Army Corps of Engineers on Tuesday.

Archaeologists from the Corps, Savannah District, Commonwealth Heritage Group, and Tidewater Atlantic Research Inc., have now retrieved 15 rusty cannons from the river since the beginning of last year. Fragments of another cannon, and other artifacts such as anchors and ammunition called bar shot used to damage the hull of ships, were also discovered.