Fort Johnson is a state-owned historic site of military and political significance located on the northeast point of James Island in Charleston County, South Carolina.

Fort Johnson was strategically important during the colonial era, as it was located on the banks of the Ashley River.

The fort was named after Sir Nathaniel Johnson, who served as the Governor of Carolina from 1703 to 1709.

These guns were heavily relied upon during the initial Confederate capture of Fort Sumter on April 13, 1861.

[3][4] Fort Johnson and the magazine were listed on the National Register of Historic Places in 1972.