Siegecraft - No Fortress Impregnable - Harold a Skaarup - Bog

It has been said that the taking of a fortress depends primarily on the making of a good plan to take it, and the proper implementation and application of the resources to make the plan work. Long before a fortress has been besieged and conquered, it has to have been outthought before it can be outfought. This book outlines some of the more successfully thought out sieges, and demonstrates why it is that no fortress is impregnable.