What nation came to the land?
Rashi: The verse calls the locusts like an army of nations.
Radak: Every gathering of living beings is called a nation. It says about ants "Am Lo Az", and about hares "Am Lo Atzum" (Mishlei 30:25-26).
Malbim: The verse depicts locusts as a nation, for they join together like a nation.
What do we learn from "Atzum v'Ein Mispar"?
Malbim: The quality of its strength is Atzum (awesome), and its number is uncountable.
What do we learn from "Shinav Shinei Arye"?
Radak: It is as if it has teeth like a lion.
Malbim: An Arye's strength is in its Shinayim; a Lavi's strength is in its Mesal'os - they can destroy everything!
What are "Mesal'os"?