Way back in the 70s I wrote a song about Reepicheep, the mouse in C. S. Lewis's The Voyage of the Dawn Treader.
Theistic philosopher Paul Copan, in the Introduction to War, Peace, and Violence: Four Christian Views, presents Reepeicheep as a just war theorist. Copan writes:
"Why did Reepicheep carry a sword? Because he, as a knight of Narnia, lived in a dangerous world, he went to dangerous places, and he wanted to protect his family, countrymen, and his leaders. Although Reepicheep was easily offended, he was not an aggressor. He did not bully his fellow citizens. He did not seek to conquer or enslave foreigners. He was a protector, a defender, a champion. He was motivated by love: love of home, love of family, love of country, and, ultimately, in Lewis’s rendition, love of God. That is the essence of just war statecraft."
P. 17.