What does 2 Samuel 1:21 mean?

Mountains of Gilboa, let no dew or rain fall on you, and may your fields never produce crops, because that's where the shields of the mighty were defiled, where Saul's shield was abandoned, no longer anointed with oil. 2 Samuel 1:21 - Modern Text Bible

(David curses the place where Saul died, wishing it to be barren because of the tragedy that happened there.)