R.W. Peake writes, I think, a different type of book than your traditional historical fiction novel. Peake tells the story of Titus Pullus, an ordinary Roman from Hispania who joins the legions and rises to become Primus Pillus of the 10th legion. Through the eyes of Pullus the readers are treated to a first hand account of some of the most significant events in Roman history. These include (in the series) Caesar's conquest of Gaul, the failed invasion of Britannia, the Civil War following Caesar's death, Marcus Antonius' failed invasion of Parthia, and, finally, the titanic struggle between Octavian and Marcus Antonius. This is what the series does so well.
Initially I struggled with these books. Wanting Pullus to overcome a nemesis in each book. This would be similar to the works of Simon Scarrow or Bernard Cornwell. But given the type of historical fiction that Peake is writing I'm not sure it is strictly needed. And Peake brings the era to life so well and in such detail that I don't mind. Following Pullus means following a successful man who rose through the ranks to a position of prominence. This gives us a first hand view into some great moments in history. And I think that is enough to give the book a solid four stars.