The Great Emu War
The Emu War was a wildlife management military operation undertaken in Australia over the later part of 1932 to address concerns over the number of emus said to be destroying crops in Western Australia.
The military operation attempted to curb the population of emus by employing Royal Australian Artillery soldiers armed with Lewis guns. Despite the military's best efforts, the emu population persisted and continued to cause crop destruction.
So effectively Australia waged a war on Emus and the Emus won!