A French ship of the line was a powerful warship used primarily in the 17th to 19th centuries. These ships were designed for naval battles and typically carried a large number of cannons on multiple decks. They played a crucial role in establishing and maintaining France's naval dominance during various conflicts, including the Napoleonic Wars. These vessels were characterized by their robust construction and impressive size, often exceeding 100 feet in length. The French navy built several classes of ships of the line, which were essential for fleet actions and blockades, contributing significantly to France's maritime strategy and military history.