The Mouse That Roared 1959

Directed by Jack Arnold | Starring: Jean Seberg, Peter Sellers, Timothy Bateson, David Kossoff

The Duchy of Grand Fenwick decides that the only way to get out of their economic woes is to declare war on the United States, lose and accept foreign aid. They send an invasion force (in chain mail, armed with bows and arrows) to New York and they arrive during a nuclear drill that has cleared the streets.