I spent a very good couple of hours reading at your link. Thank you.
For those that want to know before they click, it has old weapon drills and other resources and in particular has a resource on siege warfare, the design and history of fortifications in the age of cannon. Bastions, glacis, mutual support - the star shaped fort.
I just got back from a cycling holiday with friends in France. Our route took us past Fort Medoc, a humble four-pointed fort of Vauban which with a gun turret in the river and renewed fortifications on the other side at Blaye, formed a defense against ships approaching Bordeaux along the Gironde, a very long inlet from the Atlantic. The bastions were all earth, and the fort was abandoned about 1916.
In the Musee de l'Armee in Paris is a collection of relief models of the various forts built by Vauban to safeguard La France. Blaye and the island gun turret were there, but Fort Medoc was too small and insignificant and there was no model of it. But the amazing terrain models and building to fortify the other great forts of France - wow! If you have any interest in military history its well worth your time, and while you are there you can see many, many amazing French (and other) cannon.