Description: Fort Rensselaer(1): Revolutionary War, also known as Fort Plain. South side of Mohawk River near village of Fort Plain. See Fort Plain. Fort Rensselaer(2): 1750, Montgomery County, Canajoharie. One and 1/2 story fortified stone house of Marte Janse Van Alstyne on present day Moyer Street. Also known as Fort Van Alystyne. Meeting place of Tryon County Committee of Safety. Fortified early in war unknown if palisaded.