The Mouse That Roared (1959)

The tiny Duchy of Grand Fenwick, broke and outcompeted in the wine trade, declares war on the United States in order to lose and collect the aid that follows. Its chain-mailed archers land in New York during an air-raid drill and accidentally capture a doomsday bomb. Peter Sellers plays three roles, a warm-up for Strangelove five years later. The target is Cold War foreign aid and the logic of deterrence, handled with an Ealing-style gentleness. Lighter than most here, and a good choice for a mixed audience.