I'm reading a mystery book set in 1879 called Silver Lies and this passage made me confused with the grammar usage of the word "war". In the passage, Inez (the detective of the story) discovers that her companion had lost the knife he had kept since the Civil War. "Oh Abe, not your knife. You've carried that since the War." Is it appropriate to capitalize the word "war" if you're referencing to a specific war? Also, and this may be me confusing myself, does "War" usually reference the last big conflict?