Books

Eagles Over Britannia: The Roman army in Britain by Guy de la Bédoyère (Tempus Publishing, 2003)
Ruins of Roman forts, tombstones, altars, and letters reveal something of the soldiers who fought in the Roman army. This comprehensive survey reveals how the Roman army was the effective engine behind the Romanisation of Britain.
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The Roman Army at War 100 BC-AD 200 by Adrian K Goldsworthy (Clarendon Press, 1998)
Examines the way the Roman army waged war and attempts to paint a terrifying picture of what actually happened during a battle, looking at tactics, leadership and morale.
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Roman Army: Wars of the empire by Graham Sumner (Brassey's UK, 2000)
Contrary to popular belief, Ancient Roman warriors served in a wide variety of armour and equipment. As this book shows, the development of Roman arms and armour mirrored the influence of foreign example on the Roman legionary, until ultimately he differed little in dress from his adversaries.
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Links

Life in the Roman Army
www.vroma.org/~bmcmanus/romanarmy.html
Explains the different ranks and living conditions of soldiers dispersed throughout the empire. The site has many reconstructions of camps and military props.

Military Resources
www.dalton.org/groups/Rome/RMil.html
A gateway site with links to sites on warfare in the Roman empire, military roads and weaponry plus articles about the legionaries.

Roman Battles
www.roman-emperors.org/assobd.htm#
Comprehensive list of imperial battles with location maps and links to biographies of the chief military figures.

Britannia: The Roman army and navy in Britain 55 BC-AD410
www.castra.org.uk
Fortresses, forts, watchtowers, temporary camps, depots and industrial sites, with photographs, reconstructions and other background material and the military history of the province of Britannia.