"Boule de Suif" (translated variously as "Dumpling", "Butterball", "Ball of Fat", or "Ball of Lard") is a famous short story by the late 19th-century French writer Guy de Maupassant first published on 15/16 April 1880. It is arguably his most famous short story and is the title story for his collection on the Franco-Prussian War, titled Boule de Suif et Autres Contes de la Guerre (Dumpling and Other Stories of the War).
The story is set in the Franco-Prussian War and follows a group of French residents of Rouen, recently occupied by the Prussian army. The ten travellers decide for various reasons, to leave Rouen and flee to Le Havre in a stagecoach. Sharing the carriage are Boule de Suif or "Butterball" (lit.suet dumpling, also translated as ball of fat), a prostitute whose real name is Elisabeth Rousset; the strict Democrat Cornudet; a shop-owning couple from the petty bourgeoisie, M. and Mme. Loiseau; a wealthy upper-bourgeoisie factory-owner and his wife, M. and Mme. Carré-Lamadon; the Comte and Comtesse of Bréville; and two nuns. Thus, the carriage constitutes a microcosm of French society, representing different parts of the French population during the late 19th century.
Due to the terrible weather, the coach moves very slowly and by midday has only covered a few miles. The occupants initially snub Boule de Suif but their attitudes change when she produces a picnic basket full of lovely food and offers to share its contents with the hungry travellers.
At the village of Tôtes, the carriage stops at the local coaching inn, and the occupants, hearing a German voice, realise they have blundered into Prussian-held territory. A Prussian officer detains the party at the inn indefinitely without telling them why. Over the next two days, the travellers become increasingly impatient, and are finally told by Boule de Suif that they are being detained until she agrees to sleep with the officer. She is repeatedly called before the officer, and always returns in a heightened state of agitation. Initially, the travellers support her and are furious at the officer's arrogance, but their indignation soon disappears as they grow angry at Boule de Suif for not sleeping with the officer so that they can leave. Over the course of the next two days, the travelers use various examples of logic and morality to convince her it is the right thing to do; she finally gives in and sleeps with the officer, who allows them to leave the next morning.