6 books in series

Osprey Battle Orders

Osprey Battle Orders is a 6-book series with 6 released primary works first released in 2007 with contributions by Nic Fields, Gregory Fremont-Barnes, Duncan Anderson, Pier Paolo Battistelli, and Stephen Turnbull.

The Roman Army of the Punic Wars 264–146 BC
The Royal Navy 1793–1815
The Roman Army: The Civil Wars 88–31 BC
Panzer Divisions
Samurai Armies 1467–1649
The Roman Army of the Principate 27 BC–AD 117