Taking no chances Pharaoh Nectanebo I fortified all 7 mouths of this river around 380 B.C.

Fort Bourtange in the Netherlands is this celestial type; an attacker who gets close to one wall is exposed to fire from another

In 1835 Mexican General Martin Perfecto de Cos fortified this mission in San Antonio but soon had to surrender it

Built with siege amenities like a 500-foot-deep well the Königstein Fortress is aka the Saxon this after a Paris prison

In the 1070s this monarch who'd been in power only a short while ordered the building of the Tower of London