First Barbary War: USS Enterprise, an American schooner, captured the Tripolitan polacca Tripoli in a single-ship action off the coast of Libya.

The First Barbary War (1801–1805), also known as the Tripolitan War and the Barbary Coast War, was a conflict during the 1801–1815 Barbary Wars, in which the United States fought against Ottoman Tripolitania. Tripolitania had declared war against the United States over disputes regarding tributary payments in exchange for a cessation of Tripolitanian commerce raiding at sea. United States President Thomas Jefferson refused to pay this tribute. The First Barbary War was the first major American war fought outside the New World, and in the Arab world, besides the smaller American–Algerian War (1785–1795).

USS Enterprise was a schooner, built by Henry Spencer at Baltimore, Maryland, in 1799 for the United States Navy. Her first commander thought that she was too lightly built and that her quarters, in particular, should be bulletproofed. Enterprise was overhauled and rebuilt several times, effectively changing from a twelve-gun schooner to a fourteen-gun topsail schooner and eventually to a brig. Enterprise saw action in the Caribbean, the Mediterranean, and the Caribbean again, capturing numerous prizes. She wrecked in July 1823.

A schooner is a type of sailing vessel defined by its fore-and-aft rig on all of two or more masts and the foremast generally being shorter than the mainmast. The most common variants are gaff-rigged and staysail schooners, with the topsail schooner carrying a square topsail on the foremast, and Bermuda and junk-rigs being rarities.

The action of 1 August 1801 was a single-ship action of the First Barbary War fought between the American schooner USS Enterprise and the Tripolitan polacca Tripoli off the coast of modern-day Libya.