Fort Ticonderoga (/taɪkɒndəˈroʊɡə/), formerly Fort Carillon, is a large 18th-century star fort built by the French at a narrows near the south end of Lake Champlain in northern New York. It was constructed between October 1755 and 1757 by French-Canadian military engineer Michel Chartier de Lotbinière, Marquis de Lotbinière during the French and Indian War, sometimes known overseas as the "North American theater" of the Seven Years' War. The fort was of strategic importance during the 18th-century colonial conflicts between Great Britain and France, and again played an important role during the American Revolutionary War.
The site controlled a river portage alongside the mouth of the rapids-infested La Chute River, in the 3.5 miles (5.6 km) between Lake Champlain and Lake George. It was strategically placed for the trade routes between the British-controlled Hudson River Valley and the French-controlled Saint Lawrence River Valley.