But due to considerable differences in style, scholarly consensus has ruled out Hirtius or Julius Caesar as the authors of the two last parts.
Regarding De Bello Hispaniensi T. Rice Holmes writes:[2] "Bellum Hispaniense is the worst book in Latin literature; and its text is the most deplorable.
The copyists performed their tasks so ill that in the forty-two paragraphs there are twenty-one gaps and six hundred corrupt passages, which Mommsen and lesser men have striven with an industry worthy of a better cause to restore."
In this the book is markedly different from Caesar's own commentaries and the de Bello Alexandrino, in which details of cavalry numbers and actions are few.
From the detailed descriptions of topography, the information about the weather, and the numbers of casualties recorded even when very small, it is clear that he was also an eye-witness to the events described.