Other Roman era authors and I don't know if they're ebook'd - John Maddox Roberts, James Mace, Ben Kane and Harry Sidebottom
Sharpe's Rifles (Napoleonic era series) and various other historical series by Bernard Cornwell.
Patrick O'Brian's Aubrey/Maturin Naval Napoleonic era series
Rafael Sabatini's Captain Blood series
Dumas' books
You can check the author's here and see if any are book'd -
http://www.mcbooks.com/bookstore/cat...Fiction&list=7
edit: actually on second thought - John Maddox Roberts are mysteries instead of battles.