The story of 'Arms and the Man' a romantic comedy play by George Bernard Shaw is based on -

Arms and the Man, a romantic comedy in three acts by George Bernard Shaw, was produced in 1894 and published in 1898.
- The play is set in the Petkoff household in Bulgaria and satirizes romantic ideas concerning war and heroism during the Serbo-Bulgarian War.
- A battle-weary officer, a Swiss mercenary fighting for the Serbian army, takes refuge in Raina Petkoff’s bedchamber, where she agrees to hide him from the authorities.
- In response to his matter-of-fact account of the war, in which he debunks her fiancé Sergius’ heroism, Raina at first ridicules the intruder’s cowardliness but ultimately appreciates his honesty.

Source: Britannica