The Hemingway novel you are referring to is titled "A Farewell to Arms." Published in 1929, it is a war novel set during World War I and tells the story of an American ambulance driver in the Italian army and his love affair with a British nurse. The novel explores themes of love, war, and the disillusionment and loss experienced by those involved in the conflict. "A Farewell to Arms" is considered one of Ernest Hemingway's notable works and has been widely studied and acclaimed.