There are two guns in a park on Bay Street, but they date from the Revolution. They were buried in 1861, and dug up in 1872. Maybe this has led to some confusion. I have been to Ft. Jackson, and a long time ago, to pulaski. All the guns there are large coastal pieces. Check this sit:
http://www.ci.savannah.ga.us/cityweb/p&tweb.nsf/4bf6a0ca45844e1685256c2f0071a3fb/7b34931450f2140a85256c5a004a73c7?OpenDocument Stan