This is an unusual movie in that it is in several parts (5 in all) covering the history of the 'conquest' of the Wild West from 1839 to 1889, a 50-year period that encompasses the American Civil War. The common thread is the story of 2 sisters, Eve Prescott and her sister Lilith (Debbie Reynolds). The all-star cast includes James Stewart as Linus Rawlings, a trapper and 'mountain man' (in Part 1), Cleve Van Valen (Gregory Peck) as a professional gambler, Zeb as the son of Eve Prescott (George Peppard), ruthless railroad man Mike King (Richard Widmark), and a few more, including a cameo appearance by John Wayne as a US Army senior officer during the Civil War.
Each of the 5 stories is, in a way, a film in its own right. The movie itself is divided into 2 overall parts (there are 2 DVDs, in fact). Unusually, the various parts of the movie were directed by different directors (Henry Hathaway, John Ford...). The various parts of the film are of unequal quality and merit. The 1st part is weak in some ways, in my view, if only because James Stewart is not quite young enough to play the character that he plays in a convincing manner. The section about the Civil War (John Ford) is not very good at all and lacks coherence. Overall, the parts of the movie directed by Henry Hathaway are the best, and the 2nd half of the movie is better, in my view. George Peppard is good in the role he plays, sustaining all that section of the movie centred on the expansion of the railways across the West. What is probably the most memorable and spectacular scene relates to the railroads and is in Part 5, towards the end. If only for that section, the film is worth seeing. (I do not want to say any more so as not to spoil the plot for those reading this review who do not know the story yet.)
Despite its lack of unity and its uneven quality, it is a very good, epic western like none other, accompanied by an amazing score. All amateurs of westerns will enjoy watching it. I first saw it as a teenager, many decades ago, and enjoyed seeing it again on DVD over New Year.