The papers in this book present, for the first time, the world of warfare, both defensive and offensive, from the Classical periods to end of the Middle Ages in one collection. These scholarships have attracted ancient writers and generals and nowadays historians, archaeologists and researchers poliorcetics. Military historiography and ancient manuals are well familiar from the Classical period throughout the Hellenistic great battlefields until the end of the Middle Ages, the chronological scope of this codex. The current book is the first to encompass this long array of time while trying to enrich the reader with the continuity, development and regression in the different periods and spheres of the ancient poliorcetics and beyond; the papers presented here are focusing on the physical fortifications, besieging and defense techniques, development and efficiency of ancient projectiles and sieging machinery, battlefields and the historiographical evidence. The X papers of the book, are written by some of the best scholars in their field, presenting here for the first time the results of their research, in the west and in the east.