The Falklands War
In a desperate attempt to retain the support of its population following a dictatorship, the Argentine government attempted to steal a small island a couple of kilometers from their coast that was under British rule.
But the Brits had ships, planes, trucks, tanks and a trained army of soldiers ready to fend off the less experienced Argentine force that invaded. In the end, Argentina lost 700 soldiers and $850 million to the war, and they are unable to stake any legitimate claim to the island to this day.