There are 2 books in the Cambridge History of War series. The newest book is War and the Modern World which came out in 2012.

1
War and the Medieval World

Book cover of War and the Medieval World
Volume II of The Cambridge History of War covers what in Europe is commonly called 'the Middle Ages'. It includes all of the well-known themes of European warfare, from the migrations of the Germanic peoples and the Vikings through the Reconquista, the Crusades and the age of chivalry, to the…
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2
War and the Modern World

By Roger Chickering (editor), Dennis Showalter (editor), Hans van de Ven (editor)

Book cover of War and the Modern World
Volume IV of The Cambridge History of War offers a definitive new account of war in the most destructive period in human history. Opening with the massive conflicts that erupted in the mid nineteenth century in the US, Asia and Europe, leading historians trace the global evolution of warfare through…