In 1974, 29 years after the end of the Second World War, Japanese soldier Hiroo Onoda finally surrendered after almost three decades of fighting a guerilla campaign on a remote island in the Philippines. ​But why did he keep fighting? Are humans just inherently warlike?

In our latest documentary on History Hit, Dr. Nam C. Kim and Dr. Marc Kissel guide us in a journey backwards through time to uncover the earliest signs of warfare; joined on the way by ancient weapons expert Dr. Annemieke Milks and primatologist Dr. Bonaventura 'Bino' Majolo, to answer the big question - is warfare just part of our nature?