Fort at #4 is located in Charlestown and was built in the mid-18th century for the protection of Plantation #4, the most northern British settlement in New Hampshire along the Connecticut River at that time. The fort was a rectangle of six houses which included a Great Hall, guard tower, and stables. It was the site of military attack between the British, French, and Native Americans. Visiting Fort at #4 allows visitors to travel back in time by wandering the reconstructed village grounds, viewing reenactments, and participating in hands-on educational activities and workshops. The fort is open seasonally from May through the first weekend of November.