Fort Pulaski is a brick fort built between 1829 & 1847 to protect Savannah, Georgia. During the Civil War, Union troops began a long sustained bombardment of Fort Pulaski using the new rifled cannon which could go farther (4-5 miles) than the larger and heavier smoothbore cannonball (.5 mile.) The Union breached the brick walls, and the Confederates surrendered the fort, ceasing all shipping in and out of Savannah. The loss of Savannah as a viable Confederate port crippled the Southern war effort.

See Fort Pulaski National Monument – Wikipedia and Official NPS website: Fort Pulaski National Monument.