The gun with which Vinson Gowrie was shot was "an automatic pistol" taken from a German officer whom Buddy McCallum had captured during World War I (161).
Vicksburg, where the oldest of Nub Gowrie's sons is the "manager of a delta cotton plantation" (160), is a small city in Mississippi, on the Mississippi River. It played a major role in the Civil War, and is often mentioned in Faulkner's fictions.