Classics:
* The Iliad & The Odyssey (Homer): Greek epic poems about the Trojan War.
* The Red Badge of Courage (Stephen Crane): A coming-of-age story set during the American Civil War.
* All Quiet on the Western Front (Erich Maria Remarque): A chilling account of World War I from a German soldier's perspective.
* For Whom the Bell Tolls (Ernest Hemingway): A story of love and war set during the Spanish Civil War.
* Catch-22 (Joseph Heller): A satirical novel about the absurdity of war, set in World War II.
Modern War Fiction:
* The Things They Carried (Tim O'Brien): A collection of interconnected stories about the Vietnam War.
* The Kite Runner (Khaled Hosseini): A story of friendship and loss set against the backdrop of the Soviet invasion of Afghanistan.
* A Long Petal of the Sea (Isabel Allende): A novel about a family fleeing the Spanish Civil War.
* The Book Thief (Markus Zusak): A novel narrated by Death, set in Nazi Germany during World War II.
* The Nightingale (Kristin Hannah): A story about two sisters in occupied France during World War II.
Historical Fiction:
* The Nightingale (Kristin Hannah): As mentioned above, this novel tells the story of two sisters in occupied France during World War II.
* The Book Thief (Markus Zusak): This novel, also mentioned above, is set in Nazi Germany during World War II.
* The Help (Kathryn Stockett): This novel follows the lives of African American maids working in white households in Mississippi during the Civil Rights era.
* The Guernsey Literary and Potato Peel Pie Society (Mary Ann Shaffer and Annie Barrows): This novel tells the story of a writer who travels to Guernsey to interview members of a book club that formed during the Nazi occupation of the island.
* The Remains of the Day (Kazuo Ishiguro): A novel about a butler who reflects on his life and his service to a lord in pre-war England.
Non-Fiction:
* Slaughterhouse-Five (Kurt Vonnegut): A semi-autobiographical novel about the author's experiences as a prisoner of war during World War II.
* The Diary of a Young Girl (Anne Frank): A moving account of a young Jewish girl's life in hiding during the Nazi occupation of the Netherlands.
* The Guns of August (Barbara W. Tuchman): A Pulitzer Prize-winning account of the outbreak of World War I.
* Hiroshima (John Hersey): A powerful account of the aftermath of the atomic bombing of Hiroshima.
* The Yellow Birds (Kevin Powers): A Pulitzer Prize-nominated novel about the psychological effects of war on American soldiers in Iraq.
Other Genres:
* The Lord of the Rings (J.R.R. Tolkien): A fantasy epic that features a large-scale war between good and evil.
* Star Wars (George Lucas): A science fiction franchise that depicts intergalactic conflicts and wars.
* The Hunger Games (Suzanne Collins): A dystopian novel about a televised battle royale that takes place in a post-apocalyptic world.
It is important to note that this is just a small selection of the vast number of books that have been written about war. There are many other great works of literature out there that explore the themes of war and its impact on individuals, societies, and the world.
To find more books based on war, you can search online databases like Goodreads or LibraryThing, or browse the shelves of your local bookstore or library.