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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 to New York (armed with longbows) which arrives during a nuclear drill that has cleared the streets.
Currently you are able to watch "The Mouse That Roared" streaming on Crackle for free with ads or buy it as download on Google Play Movies, YouTube. It is also possible to rent "The Mouse That Roared" on Google Play Movies, YouTube online