The first John Adams was originally built in 1799 as a frigate for the United States Navy, converted to a corvette in 1809, and later converted back to a frigate in 1830. Named for President John Adams, she fought in the Quasi-War, the First and Second Barbary Wars, the War of 1812, the Mexican–American War and the American Civil War. At the end of her career, she participated in the Union blockade of South Carolina's ports. She then participated in the raid on Combahee Ferry that Harriet Tubman, the former slave and Union operative, organized with Union colonel Montgomery. "John Adams" led three steam-powered gunboats up the Harbor River to Port Royal. The squadron relied on local black mariners to guide it past mines and fortifications. The squadron freed 750+ slaves and unsettled the Confederacy. Tubman was the first woman in U.S. history to plan and execute an armed expedition.