"Madmen" here is a town in Moab. The name of the city has nothing to do with the English word "madmen." Alternate translation: "Their enemies will destroy the city of Madmen" (See: [[rc://en/ta/man/translate/translate-names]])
Here "sword" represents the enemy army carrying weapons. Alternate translation: "your enemies will chase after you and kill you" (See: [[rc://en/ta/man/translate/figs-metonymy]])