The Howlett Line was a critical Confederate earthworks dug during the Bermuda Hundred Campaign of the United States Civil War in May 1864. Specifically, the line stretched across the Bermuda Hundred peninsula from the James River to the Appomattox River. It was named for the Howlett House that stood at the north end of the line. The Howlett line became famous as the "Cork in the Bottle" by keeping General Butler's Army of the James at bay.