I am looking for the name of a war movie in which the two countries fighting sent a lone soldier to fight instead of an entire army. It took place on an island and I don't believe they had weapons. During the movie the warring factions sent another soldier to help win the fight. This was against the rules and the original combatants killed their own man out of respect. The winner was supposed to transmit a code back to the countries declaring victory. It ended with both men dying on the beach and only the transmission being sent without the code so neither side knew which man won. I saw this on TV as a kid in 70's. I know one of the soldiers was American and I think the other was Japanese.
