1)
What is the significance of these nations?
1.
Malbim: This is the army of Yishmael. Paras are brothers of Eilam. Kush and Put will be with them - Kush are relatives of Ashur, and Put to Egypt. These are the same nations mentioned above ? Egypt, Ashur and Eilam (32:18 22, 24).
2)
What is the meaning of "Kulam Magen v'Chova"?
1.
Radak: All are with shields and helmets.