This work investigates the origins of Crusader military architecture and the extent to which Western castle design was influenced by Eastern fortification techniques during the 12th century. T. E. Lawrence, writing in 1910, presents a detailed analysis of various fortifications in the Levant to argue that these structures were primarily an extension of Western European military traditions. The text challenges the prevailing historical assumption that the Crusaders adopted significant architectural innovations from their Eastern counterparts, positing instead that Western military architecture remained largely independent of Oriental influence during this period.

Experts recognize this volume as a foundational, albeit controversial, text in the study of medieval military architecture. Readers frequently note the academic density of the prose and the historical significance of Lawrence's early field observations.