As a military historian, Josephus compares very favorably with the other major military writers of the Roman period. He deserves much more attention, not simply as a source of facts about ancient warfare, but as an experienced and critical writer on military affairs. Standing military forces usually keep careful records of the exact numbers of soldiers present, as well as those killed and captured in battle. Some of Josephus's figures on the size of the Roman military forces were probably based on official documents. Literary theory has had an impact on our understanding of Josephus as a military historian. Topoi play a significant role in the analysis of ancient military writing, including that of Josephus. Additionally, Josephus used Greek military terminology in a way that indicates a great deal of familiarity with it, as evident from his use of military vocabulary from Judean Antiquities.