The first edition of the Ernest Hemingway novel For Whom the Bell Tolls is published.

For Whom the Bell Tolls is a novel by Ernest Hemingway published in 1940. It tells the story of Robert Jordan, a young American volunteer attached to a Republican guerrilla unit during the Spanish Civil War. As a dynamiter, he is assigned to blow up a bridge during an attack on the city of Segovia.

It was published just after the end of the Spanish Civil War (19361939), whose general lines were well known at the time. It assumes the reader knows that the war was between the government of the Second Spanish Republic, which many foreigners went to Spain to help and which was supported by the Communist Soviet Union, and the Nationalist faction, which was supported by Nazi Germany and Fascist Italy. In 1940, the year the book was published, the United States had not yet entered the Second World War, which had begun on September 1, 1939, with Nazi Germany's invasion of Poland.The novel is regarded as one of Hemingway's best works, along with The Sun Also Rises, A Farewell to Arms, and The Old Man and the Sea.

Ernest Miller Hemingway (July 21, 1899 – July 2, 1961) was an American novelist, short-story writer, journalist, and sportsman. His economical and understated style—which he termed the iceberg theory—had a strong influence on 20th-century fiction, while his adventurous lifestyle and his public image brought him admiration from later generations. Hemingway produced most of his work between the mid-1920s and the mid-1950s, and he was awarded the 1954 Nobel Prize in Literature. He published seven novels, six short-story collections, and two nonfiction works. Three of his novels, four short-story collections, and three nonfiction works were published posthumously. Many of his works are considered classics of American literature.

Hemingway was raised in Oak Park, Illinois. After high school, he was a reporter for a few months for The Kansas City Star before leaving for the Italian Front to enlist as an ambulance driver in World War I. In 1918, he was seriously wounded and returned home. His wartime experiences formed the basis for his novel A Farewell to Arms (1929).

In 1921, he married Hadley Richardson, the first of four wives. They moved to Paris where he worked as a foreign correspondent and fell under the influence of the modernist writers and artists of the 1920s' "Lost Generation" expatriate community. Hemingway's debut novel The Sun Also Rises was published in 1926. He divorced Richardson in 1927, and married Pauline Pfeiffer. They divorced after he returned from the Spanish Civil War (1936–1939), which he covered as a journalist and which was the basis for his novel For Whom the Bell Tolls (1940). Martha Gellhorn became his third wife in 1940. He and Gellhorn separated after he met Mary Welsh in London during World War II. Hemingway was present with Allied troops as a journalist at the Normandy landings and the liberation of Paris.

He maintained permanent residences in Key West, Florida (in the 1930s) and in Cuba (in the 1940s and 1950s). He almost died in 1954 after plane crashes on successive days, with injuries leaving him in pain and ill health for much of the rest of his life. In 1959, he bought a house in Ketchum, Idaho, where, in mid-1961, he committed suicide.