(SOLVED) color Western from 1940s-1960s with a small group of whites stranded in the desert surrounded by attacking Native Americans

If I remember correctly, the group started with less than a dozen people. One of them was a woman. I think some of them were soldiers in uniform.

When they came under attack from a large body of Native American warriors they hunkered down in a ditch completely surrounded by a wide expanse of empty desert. The natives repeatedly attacked, killing them one by one. One member of the group was shot through the throat with an arrow. Another was shot in the leg with an arrow in a barrage from long-range archers.

The natives rode up on horseback and threw down a number of sticks into the ground. I assume those sticks were used as markers to help their long-range archers target the trapped group. One of the whites died while running from stick to stick to take them out of the ground.

The last two of the men in the group seemed to be some sort of enemies or foes. If I remember correctly, the one that died did so without receiving any wound. Once the group was down to the woman and the other man, he left the ditch to confront the natives and that's when the cavalry showed up to save them.