The movie War Goddess (1973), all-female Amazon army is battling an all-male Greek army at 6:04:
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The battle ends with sudden ceasefire, there's a nice scene of an Amazon woman schoolgirl pinning a man at 8:37
Here's the entire movie on YouTube:
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There are some more m vs f scenes, at 33:25 Amazon women win a competition against men, 45:15 another battle against men.
It's a very erotic movie, there are some lesbian scenes and also erotic f vs f wrestling. First at 7:15 where two Amazon women wrestle naked to determine who the next queen Will be. Then at 1:15:07 those two women fight and wrestle naked again. They end up kissing passionately afterwards.