"Friday analyzes Heian-, Kamakura- and Nambokucho-period warfare from five thematic angles. He examines the principles that justified armed conflict, the mechanisms used to raise and deploy armed forces, the weapons available to early medieval warriors, the means by which they obtained them, and the techniques and customs of battle." "A thorough, accessible and informative review, this study highlights the complex causal relationships among the structures and sources of early medieval political power, technology and the conduct of war."--Jacket.