When do we know how the major conflict in the story will be resolved? the story Occurrence at Owl Creek Bridg?

Answer 1

That would depend on how good the reader is at detecting foreshadowing. There are a number of incidents in the story that seem too unrealistic, too dreamlike to occur. Bierce used these outlandish occurrences to foreshadow the man's death at the end of the story.
As early as the second paragraph, the narrator tells us that "Death is a dignitary who when he comes announced is to be received with formal manifestations of respect, even by those most familiar with him." Bierce almost gives away the ending right there. Then, in the next to the last sentence of the second paragraph. "Those most familiar with him," are the soldiers because they have seen death so many times. They stand at attention in uniform, weapons ready, and eyes cold, therefore giving respect to Death.
When the rope breaks and Farquhar falls into the water, his "physical senses were... preternaturally keen and alert....they made record of things never before perceived." He sees every leaf of every tree, every blade of grass, and every drop of dew. He hears fish swim through the stream and the movement of the legs of a water spider.
Later, we are told that "the man in the water saw the eye of the man on the bridge gazing into his own through the sights of the rifle. He observed that it was a gray eye..." But at the beginning of the story, we are told that the "swift water [is] twenty feet" below the bridge. How could he see the man's eye from at least twenty feet away?
After he dodges bullets and cannons, he becomes trapped in a whirlpool, or "vortex" and "in few moments he was flung upon the gravel at the foot of the left bank of the stream." He begins the journey home, but he "had not known that he lived in so wild a region." Everything he sees is new and spectacular now. "Overhead... shone great golden stars looking unfamiliar and grouped in strange constellations."

All of these excerpts foreshadow the resolution of the major conflict - Man versus Man - and give the alert reader strong hints that the story will be resolved by Farquhar's death.