This 5-volume reference from Wiley-Blackwell is a comprehensive resource covering the global history of warfare from ancient times to the present day.

“The widest ranging account compiled in one volume of war, peace, and the U.S. military.”

"This reference provides an overview of military leaders, theorists, campaigns, battles, and strategies throughout history, with a focus upon land warfare in Europe and America from the 18th century to the present....Entries on key topics such as intelligence, propaganda, tactics, women in the military, and peacekeeping are included."

Three-volume online encyclopedia that "provides historical, cultural and social context of works that focus on armed conflict throughout the world and time. It highlights the realities of war, its impact on society, and how it affects our understanding of it."