Medieval Münster had about 10,000 inhabitants and was enclosed by an almost impregnable system of defenses , about 300 feet [ 90 m ] wide and some 3 miles [ 5 km ] in circumference .
Medieval Munster had about 10,000 inhabitants and was enclosed by an almost impregnable system of defenses , about 300 feet [ 90 m ] wide and some 3 miles [ 5 km ] in circumference .