What is the author's style in Tides of War: A Novel of Alcibiades and the Peloponnesian War by Steven Pressfield?

The point of view in the novel is complex and varies. Polemides' story is told as if in first person, but relayed through two other voices. Jason's contributions are largely first person, though relayed by one other voice and also include fragments of letters which are first person. This complex point of view leads to an unreliable voice. The authenticity of events and emotions can constantly be called into question as they are filtered through multiple voices.