Osprey Publishing, 2012. — 50 p. — ISBN: 1849087957.
This book, the second volume of a two-part study, reveals the appearance, weaponry, role and impact of these legendary soldiers during the five centuries that saw the Roman Empire reach its greatest geographical extent under Trajan and Hadrian, only to experience a long decline in the West in the face of sustained pressure from its 'barbarian' neighbours.