Up until the 1960s, westerns were a HUGE genre for Hollywood-- particularly the 1930s-50s. Thousands of westerns were made...so many that no one could possibly see them all. However, if you've seen a bunch there are certainly some common themes...and the theme in "Star in the Dust" has been seen before...quite a few times. However, there is nothing to set this one apart from the rest...and I would recommend you first see "Rio Bravo"...with a similar theme but simply a better film.
Sheriff Jorden is set to hang Sam Hall (Richard Boone) but has a problem....one group of folks wanna string him up and not bother waiting until the court appointed time...and another group wants to rescue him. Jorden (John Agar) and his two deputies (James Gleason and Paul Fix) are deputies on hand to try to carry out his orders.
Aside from an insanely vivid and crazy stunt at the end (I still can't believe they did this!) and an appearance by Mamie Van Doren, I can't see much to set this apart from a bazillion other westerns. More a time-passer than anything else.