The siege of Acre (1189–1191) was the first and principal engagement of the Third Crusade. Although Christian forces successfully besieged the city, the losses they suffered in the process significantly limited continuing crusade operations and contributed to Richard the Lionheart's inability to besiege Jerusalem. Featuring dozens of battles, skirmishes, and naval actions, Acre was one of the longest sieges of the middle ages and provides a snapshot of the practice of both western and eastern warfare in the 12th century. Unfortunately, the actual military operations of the siege have been chronically understudied in the last two centuries. This essay examines the historiography on the siege of Acre and argues that it deserves more concerted attention from military and Crusades historians alike.