Roswell's Smith Plantation will host a free lecture on the Signal Corps during the Civil War at 11 a.m. July 20 as part of the sesquicentennial observance.

Steven Rauch, a military historian who also teaches at Augusta State University, will speak on the history and function of the Signal Corps throughout the war. His discussion will include the unique evolution and importance of this arm of the military.

Information: 770-641-3978.