[5] The fort was in caretaker status prior to the American entry into World War I, and at some point was probably under the Coast Defenses of the Kennebec command.

A history of the Coast Artillery in World War I states that none of the regiments in France equipped with 6-inch guns completed training in time to see action before the Armistice.

[8] In 1924, Fort Baldwin was disarmed as part of a general drawdown of less-threatened coast defenses and sold to the State of Maine.

Early in World War II, four circular concrete "Panama mounts" were constructed at Fort Baldwin, two of them on Battery Hawley's 6-inch gun positions.

These were to provide improved firing platforms for towed 155 mm M1918 guns that were adopted by the Coast Artillery following World War I.