We decided on an excursion to Fort Simcoe one day last month. Fort Simcoe was established in 1856 as a presence to keep control of the Indians in the area. Things had been tense since the treaty in 1855. A history can be found here.
A suggestion: If you travel some 40 miles to visit a place, check ahead to make sure it is open. We visited about a week after the Fr. Simcoe State Park went into off-season hours. The gate was locked, but no one challenged us as we parked at the gate, ate our picnic lunch, and wandered the grounds on foot. There is a small visitor center with information which would have been open on the weekend.
Ah, well. It just leaves reason to go again in the spring or summer.