"Gates of Fire" is a historical novel by Steven Pressfield that recounts the Battle of Thermopylae in 480 BC. The story is told through the perspective of Xeones, a young Spartan squire, who provides insight into the lives and values of the Spartan warriors as they prepare to face the invading Persian army led by King Xerxes. The novel explores themes of honor, sacrifice, and the warrior ethos, highlighting the fierce determination of the Spartans to defend their homeland. It vividly depicts the brutal realities of ancient warfare and the camaraderie among the soldiers, making it a compelling narrative of courage and resilience.