This fully illustrated reference book charts the complete history of frigates, from their post-World War I function as escort vessels, their role as sloops and corvettes, and their subsequent transformation into post-World War II anti-submarine vessels. A country-by-country directory of over 70 classes describes the main characteristics of each vessel. Each entry, with its expert commentary and high-quality photography, is accompanied by a specification box detailing country of origin, displacement, dimensions, armament, machinery, power, performance and protection. A useful glossary containing definitions of key naval terms is included at the back of the book. With its lively narrative and over 235 photographs, this authoritative volume provides historians and enthusiasts with key information about these important naval vessels.