https://en.wikipedia.org/wiki/Citadel_Hill_(Fort_George)
https://en.wikipedia.org/wiki/Georges_Island_(Nova_Scotia)
https://en.wikipedia.org/wiki/Citadelle_of_Quebec
https://en.wikipedia.org/wiki/Old_Fort_Erie
https://en.wikipedia.org/wiki/Fort_Anne
They built these things _everywhere_, probably a good part of what bankrupted the British Empire!