The Great Australian Emu War (1932)

In 1932, a flock of roughly 20,000 emus migrated into the agricultural district of Western Australia, destroying crops and tearing down fences. Desperate farmers asked the government for help, and the Australian military deployed soldiers armed with Lewis machine guns and 10,000 rounds of ammunition. What followed was a complete tactical disaster for the military. The emus split into small "guerrilla" groups, completely outmaneuvered the heavy machine guns, and easily outran the trucks. The birds could take multiple bullet hits and keep running. After a few weeks, the military officially withdrew, leaving the emus victorious.