 During World War I, Forts Popham and Baldwin were garrisoned by about 200 men of the 13th and 29th Coast Artillery companies of the Coast Defenses of Portland.Although Fort Baldwin was disarmed in 1924, the mine facilities at Fort Popham may have remained operational through World War II, during which Fort Baldwin was rearmed with towed artillery.The fort, located two miles (3 km) from popular Popham Beach State Park, is open to the public as Fort Popham State Historic Site.