Fort Oswego was an 18th-century trading post in the Great Lakes region in North America, which became the site of a battle between French and British Army forces in 1756 during the North American phase of the Seven Years' War, known in the United States as 'The French and Indian War.' The fort was established in 1727, on the orders of New York governo…Fort Oswego was an 18th-century trading post in the Great Lakes region in North America, which became the site of a battle between French and British Army forces in 1756 during the North American phase of the Seven Years' War, known in the United States as 'The French and Indian War.' The fort was established in 1727, on the orders of New York governor William Burnet, adjacent to a 1722 blockhouse that had originally been a way station for French traders. The log palisade fort established a British presence on the Great Lakes.