1)
What is the meaning of "Cherev Paschu Resha'im"?
1.
Rashi: The Resha'im initiated conflict by themselves.
2.
Radak citing Ibn Ezra: They sharpened and polished [their swords]. This is like "Cherev Pesuchah" (Yechezkel 21:33).
3.
Radak: It is removing the sword from its case. This is called Pesichah, like removing a prisoner from his binds - "Asirav Lo Pasach Baisah" (Yeshayah 14:17).
2)
What will they do with their swords and bows?
1.
Malbim: The swords are to slaughter travelers [whom they want to rob], and the bows are to kill Aniyim (who have nothing to rob them of) from afar. They did not merely plot; they prepared their weapons!