The Mouse That Roared

The Mouse That Roared is a 1955 Cold War satirical novel by Irish-American writer Leonard Wibberley, which launched a series of satirical books about an imaginary country in Europe called the Duchy of Grand Fenwick. Wibberley went beyond the merely comic, using the premise to make still-quoted commentaries about modern politics and world situations, including the nuclear arms race, nuclear weapons in general, and the politics of the United States.

The novel originally appeared as a six-part serial in the Saturday Evening Post from December 25, 1954 through January 29, 1955, under the title The Day New York Was Invaded. It was published as a book in February 1955 by Little, Brown. The British edition used the author's original intended title, The Wrath of Grapes, a play on John Steinbeck's The Grapes of Wrath.

Wibberley wrote one prequel (1958's Beware of the Mouse) and three sequels: The Mouse on the Moon (1962), The Mouse on Wall Street (1969), and The Mouse that Saved the West (1981). Each placed the tiny Duchy of Grand Fenwick in a series of absurd situations in which it faced superpowers and won.