Something Worth Fighting For (слэш)

Set during World War II. Arthur is sent to the front lines to fight for Britain, while Merlin is left behind, struggling to cope with the absence of his best friend. Seeking to give Arthur some comfort, Merlin begins to send him pieces of a story, which tells of a legendary King and his devoted manservant.
Through their letters, Arthur and Merlin grow closer, and perhaps begin to discover feelings that they could not put into words before. But will Arthur make it through the war? And what will happen if he does?