Enligt Wikipedia :
The original sequence of novellas appeared as follows:
1. "Tros of Samothrace", 10 February 1925 (later became chapters 1–14 of the novel)
2. "The Enemy of Rome", 10 April 1925 (chapters 15–26)
3. "Prisoners of War", 10 June 1925 (chapters 27–37)
4. "Hostages to Luck", 20 August 1925 (chapters 38–51)
5. "Admiral of Caesar's Fleet", 10 October 1925 (chapters 52–66)
6. "The Dancing Girl of Gades", 10 December 1925 (chapters 67–81)
7. "Messenger of Destiny", part 1, 10 February 1926 (chapters 82–87)
8. "Messenger of Destiny", part 2, 20 February 1926 (chapters 88–92)
9. "Messenger of Destiny", part 3, 28 February 1926 (chapters 93–96)
When Tros of Samothrace was published in four paperback volumes in 1967 and 1971, the breaks between volumes coincided with Mundy's own breaks between episodes:
Tros contains "Tros of Samothrace" and "The Enemy of Rome"
Helma contains "Prisoners of War" and "Hostages to Luck"
Liafail contains "Admiral of Caesar's Fleet" and "The Dancing Girl of Gades"
Helene contains all three parts of "Messenger of Destiny"
When Tros of Samothrace was reissued in three paperback volumes in 1976, the breaks between volumes came partway through "Prisoners of War" and "Admiral of Caesar's Fleet".