Scipio Africanus: Greater Than Napoleon, by B. H. Liddell Hart. This focuses on the war with Carthage, particularly with Hannibal. Scipio Africanus was the Roman who defeated Hannibal.

Caesar's Legion: The Epic Saga of Julius Caesar's Elite Tenth Legion and the Armies of Rome, by Stephen Dando-Collins. As the title suggest, this focuses on a much later period, during and sometime after the career of Julius Caesar.