As another lover of The Warlord Chronicles, I'd recommend something by David Gemmell.
Legend, for example. It's fantasy rather than historical fiction and not quite as gritty as Cornwell's work. Most of the plot describes the build-up to a huge and very exciting battle.
There is also George R. R. Martin's amazing epic that begins with
A Game of Thrones. There are plenty of great battles in this series too with wonderfully drawn characters to boot.