"The Mouse That Roared" is a 1959 satirical comedy film directed by Jack Arnold. It stars Peter Sellers in multiple roles, including the Grand Duchess Gloriana and the bumbling Prime Minister of the fictional European country of Grand Fenwick. The plot revolves around the tiny nation declaring war on the United States in a misguided attempt to lose and receive aid. The film humorously explores themes of power and diplomacy, as the tiny nation unexpectedly wins the war due to a series of comedic misunderstandings. It highlights the absurdity of military conflicts and the unpredictability of international relations, making it a classic example of political satire.