1960s/1970s TV movie, one-on-one war story

There was a TV movie made in the late-'60s or early-'70s about a Vietname-like conflict. ISTR the outcome was to be decided by sending a champion from each side to settle the matter in single conflict. The American’s name was Gallary or Gallery or something like that. I did a character search on IMDb, but didn’t find it.

Anyone know the title?

This wasn’t an SF picture was it? Sounds vaguely like some Lloyd Bridges piece-of-crap I saw once.

Sir Rhosis

Were they piloting giant mechs?

No, it wasn’t SF. It was Vietnam-style jungle warfare. ‘Col. Gallery’ (or whatever his name was) is pitted against an Asian opponent. IIRC the idea was that the governments decided that too many people had died in the war, so they agreed to have the issue decided using champions. ‘Gallery’ discovers that he’s getting help. Whether through his value of fair play, or through worry that may invalidate the agreement and plunge the nations back into full scale operations, he kills his ‘helpers’. IIRC it ends…

… with ‘Gallery’ (or whatever his name was) killing his opponent. But he is mortally woulded himself. So the U.S. wins in the end, but the hero is killed.

The Challenge (1970), starring Darren McGavin, Broderick Crawford, and the late Mako.

Thanks.

I almost looked up Darren McGavin yesterday, but for some reason didn’t.