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The Imperial Roman Army consisted of the provincial armies, the garrison in Rome and the Roman Navy.
The brunt of the forces was in the Provincial armies that were made up by the legions and their auxiliaries in total around 240k men. The Garrison in Rome was about 15k men, although few in numbers these units were the most powerful in political terms. Finally, the Navy consisted of about 45k men.
*Sources*
Le Bohec, Yann: The Imperial Roman Army
amazon.com (affiliate): http://amzn.to/1Svtkv0
amazon.de (affiliate): http://www.amazon.de/gp/product/38682...
Webster, Graham: The Roman Imperial Army of the First and Second Centuries A.D
amazon.com (affiliate): http://amzn.to/1JX2bOY
Nemeth, Eduard; Fodorean, Florin: Römische Militärgeschichte
amazon.com (affiliate): http://amzn.to/1RScyGG
amazon.de (affiliate): http://www.amazon.de/gp/product/35340...
Fields, Nic: The Roman Army of the Principate 27 BC – AD 117
amazon.com (affiliate): http://amzn.to/1S2Rsnl
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Culham, Phyllis: Imperial Rome at War. In: The Oxford Handbook of Warfare in the Classical World
amazon.com (affiliate): http://amzn.to/1RSbwKU
https://en.wikipedia.org/wiki/Imperia...
https://en.wikipedia.org/wiki/Praetor...
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